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OPERATION MANUAL
THIS MANUAL MUST ACCOMPANY THE EQUIPMENT AT ALL TIMES.
MODELS
WT5HP
WTE5HP
WT5HPSG
WATER TRAILERS
(HONDA GX160U1TX2NH1 GASOLINE ENGINE)
(QP205SHLF HIGH PRESSURE CENTRIFUGAL PUMP)
Revision #1 (03/14/17)
PN 59248
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PROPOSITION 65 WARNING
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PAGE 2 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
Page 4
WT5HP/TE5HP/WT5HPSG
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Water Trailers
Proposition 65 Warning ........................................... 2
Table Of Contents .................................................... 4
Safety Information ................................................ 5-9
Specifications (Pump/Trailer) ................................. 10
Specifications (Engine) .......................................... 11
Dimensions ............................................................ 12
General Information ............................................... 13
Components (Water Trailer) .............................. 14-15
Basic Engine .......................................................... 16
Inspection (Engine) ................................................ 17
Inspection (In-Line Mesh Water Filter) ................... 18
Operation .......................................................... 19-26
Winterizing Procedure ...................................... 27-28
Maintenance ..................................................... 29-37
Trailer Safety Guidelines ................................... 38-52
Troubleshooting (Pump) ........................................ 53
Troubleshooting (Engine) ....................................... 54
TABLE OF CONTENTS
NOTICE
Specifications are subject to change without notice.
PAGE 4 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
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SAFETY INFORMATION
Do not operate or service the equipment before reading
the entire manual. Safety precautions should be followed
at all times when operating this equipment.
Failure to read and understand the safety
messages and operating instructions could
result in injury to yourself and others.
SAFETY MESSAGES
The four safety messages shown below will inform you
about potential hazards that could injure you or others. The
safety messages specifi cally address the level of exposure
to the operator and are preceded by one of four words:
DANGER, WARNING, CAUTION
SAFETY SYMBOLS
Potential hazards associated with the operation of this
equipment will be referenced with hazard symbols which
may appear throughout this manual in conjunction with
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safety messages.
DANGER
Indicates a hazardous situation which, if not avoided,
WILL result in DEATH or SERIOUS INJURY.
WARNING
Indicates a hazardous situation which, if not avoided,
COULD result in DEATH or SERIOUS INJURY.
CAUTION
Indicates a hazardous situation which, if not avoided,
COULD result in MINOR or MODERATE INJURY.
or NOTICE.
NOTICE
Addresses practices not related to personal injury.
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 5
Page 6
GENERAL SAFETY
NOTICE
This equipment should only be operated by trained and
Whenever necessary, replace nameplate, operation and
Manufacturer does not assume responsibility for any
accident due to equipment modifi cations. Unauthorized
use accessories or attachments that are not
recommended by Multiquip for this equipment. Damage
keep
Also, know the phone numbers
fi re department.
This information will be invaluable in the case of an
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SAFETY INFORMATION
CAUTION
NEVER operate this equipment without proper protective
clothing, shatterproof glasses, respiratory protection,
hearing protection, steel-toed boots and other protective
devices required by the job or city and state regulations.
Avoid wearing jewelry or loose fi tting clothes that may
snag on the controls or moving parts as this can cause
serious injury.
NEVER operate this equipment when not
feeling well due to fatigue, illness or when
under medication.
NEVER operate this equipment under the
infl uence of drugs or alcohol.
ALWAYS clear the work area of any debris, tools, etc.
that would constitute a hazard while the equipment is
in operation.
No one other than the operator is to be in the working
area when the equipment is in operation.
DO NOT use the equipment for any purpose other than
its intended purposes or applications.
qualifi ed personnel 18 years of age and older.
safety decals when they become diffi cult read.
equipment modifi cation will void all warranties.
NEVER
to the equipment and/or injury to user may result.
ALWAYS know the location of the nearest
fi re extinguisher.
ALWAYS know the location of the nearest
fi rst aid kit.
ALWAYS know the location of the nearest phone or
a phone on the job site.
of the nearest ambulance, doctor and
emergency.
PAGE 6 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
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PUMP SAFETY
DANGER
ALWAYS store equipment properly when it is not being
used. Equipment should be stored in a clean, dry location
out of the reach of children and unauthorized personnel.
lubricate components or attempt service on a
allow the machine a proper amount of time to
place hands or fingers inside engine
operate the engine with heat shields or
run engine without an air fi lter or with a dirty air
fi lter. Severe engine damage may occur. Service air fi lter
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SAFETY INFORMATION
NEVER operate the equipment in an explosive
atmosphere or near combustible materials. An
explosion or fi re could result causing severe
bodily harm or even death.
Accidental starting can cause severe injury
or death. ALWAYS place the ON/OFF
switch in the OFF position.
DO NOT place hands or fingers inside
pump when pump is running.
NEVER disconnect any emergency or
safety devices. These devices are intended for operator
safety. Disconnection of these devices can cause severe
injury, bodily harm or even death. Disconnection of any
of these devices will void all warranties.
Be careful of discharge whipping under pressure.
NOTICE
NEVER leave an open pump chamber unattended.
ALWAYS keep the machine in proper running condition.
DO NOT attempt to thaw-out a frozen pump by using
a torch or other source of fl ame. Application of heat in
this manner may heat the oil in the seal cavity above the
critical point, causing pump damage.
WARNING
CAUTION
NEVER
running machine.
ALWAYS
cool before servicing.
Keep machine in proper running condition.
ENGINE SAFETY
WARNING
DO NOT
compartment when engine is running.
NEVER
guards removed.
DO NOT remove the engine oil drain plug
while the engine is hot. Hot oil will gush
out of the oil tank and severely scald any
persons in the general area of the pump.
CAUTION
NEVER touch the hot exhaust manifold,
muffl er or cylinder. Allow these parts to cool
before servicing equipment.
NOTICE
NEVER
frequently to prevent engine malfunction.
DO NOT pump water greater than 140° F.
DO NOT pump liquids containing acid or alkali.
DO NOT fi ll/pump heavy debris laden water.
Fix damage to machine and replace any broken parts
immediately.
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 7
NEVER tamper with the factory settings
of the engine or engine governor. Damage
to the engine or equipment can result
if operating in speed ranges above the
maximum allowable.
Page 8
FUEL SAFETY
DANGER
TOWING SAFETY
ALWAYS inspect the hitch and coupling for wear. NEVER
Check the tire air pressure on both towing vehicle and
Trailer tires should be infl ated to 50 psi cold.
safety
attach trailer’s safety chains to towing
make sure the vehicle and trailer directional,
backup, brake and trailer lights are connected and
• Secure portable power cables in cable tray with tie
unless
posted otherwise. Recommended off-road towing is not
Avoid sudden stops and starts. This can cause skidding,
or jack-knifi ng. Smooth, gradual starts and stops will
Trailer should be adjusted to a level position at all times
Raise and lock trailer wheel stand in up position when
rolling
underneath the trailer’s bumper
Use the trailer’s swivel jack to adjust the trailer height to
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DO NOT start the engine near spilled fuel or combustible
fl uids. Fuel is extremely fl ammable and its vapors can
cause an explosion if ignited.
ALWAYS refuel in a well-ventilated area, away from
sparks and open fl ames.
ALWAYS use extreme caution when working with
fl ammable liquids.
DO NOT fi ll the fuel tank while the engine is running
or hot.
DO NOT overfi ll tank, since spilled fuel could ignite if it
comes into contact with hot engine parts or sparks from
the ignition system.
Store fuel in appropriate containers, in well-ventilated
areas and away from sparks and fl ames.
SAFETY INFORMATION
tow a trailer with defective hitches, couplings, chains, etc.
trailer.
Also check the tire tread wear on both vehicles.
ALWAYS make sure the trailer is equipped with a
chain.
ALWAYS properly
vehicle.
ALWAYS
working properly.
DOT Requirements include the following:
• Connect and test electric brake operation.
wraps.
NEVER use fuel as a cleaning agent.
DO NOT smoke around or near the
equipment. Fire or explosion could result
from fuel vapors or if fuel is spilled on a
hot engine.
CAUTION
Check with your local county or state safety
towing regulations, in addition to meeting
Department of Transportation (DOT)
Safety Towing Regulations, before towing
your water trailer.
In order to reduce the possibility of an accident while
transporting the water trailer on public roads, ALWAYS
make sure the trailer and the towing vehicle are
mechanically sound and in good operating condition.
ALWAYS shutdown engine before transporting.
Make sure the hitch and coupling of the towing vehicle
are rated equal to, or greater than the trailer “gross
vehicle weight rating.”
The maximum speed for highway towing is 55 MPH
to exceed 15 MPH or less depending on type of terrain.
improve towing.
Avoid sharp turns to prevent rolling.
when towing.
towing.
Place chock blocks underneath wheel to prevent
while parked.
Place support blocks
to prevent tipping while parked.
a level position while parked.
PAGE 8 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
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SAFETY INFORMATION
ENVIRONMENTAL SAFETY/DECOMMISSIONING
Decommissioning is a controlled process used to safely
retire a piece of equipment that is no longer serviceable.
If the equipment poses an unacceptable and unrepairable
safety risk due to wear or damage or is no longer cost
effective to maintain (beyond life-cycle reliability) and is to
be decommissioned (demolition and dismantlement),be
sure to follow rules below.
EMISSIONS INFORMATION
The gasoline engine used in this equipment has been
designed to reduce harmful levels of carbon monoxide
(CO), hydrocarbons (HC) and nitrogen oxides (NOx)
This engine has been certifi ed to meet US EPA Evaporative
Attempting to modify or make adjustments to the engine
emmission system by unauthorized personnel without
proper training could damage the equipment or create an
Additionally, modifying the fuel system may adversely affect
evaporative emissions, resulting in fi nes or other penalties.
The emission control label is an integral part of the emission
If a replacement emission label is needed, please contact
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NOTICE
DO NOT pour waste or oil directly onto the ground, down
a drain or into any water source.
Contact your country's Department of
Public Works or recycling agency in your
area and arrange for proper disposal of
any electrical components, waste or oil
associated with this equipment.
When the life cycle of this equipment is over, remove
battery, if any, and bring to appropriate facility for lead
reclamation. Use safety precautions when handling
batteries that contain sulfuric acid.
When the life cycle of this equipment is over, it is
recommended that the water trailer frame and all other
metal parts be sent to a recycling center.
Metal recycling involves the collection of metal from
discarded products and its transformation into raw
materials to use in manufacturing a new product.
Recyclers and manufacturers alike promote the process
of recycling metal. Using a metal recycling center
promotes energy cost savings.
NOTICE
contained in gasoline exhaust emissions.
emissions requirements in the installed confi guration.
unsafe condition.
Emission Control Label
system and is strictly controlled by regulation(s).
The label must remain with the engine for its entire life.
your authorized Honda Engine Distributor.
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 9
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SPECIFICATIONS (PUMP/TRAILER)
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Table 1. Specifications
Type Industrial
Style Rotomolded - Seamless with Baffles
Fill Port 12" - Vented Port
Water Tank
Pump
Trailer and Frame
Material Polyethylene - 1/4" Wall - Repairable
Fill Rate 6 min. Full (Fill at Full Throttle)
Capacity 525 gallons (1,987 liters)
Weight w/ Empty Water Tank 1,530 lbs. (694 kg)
Weight w/ Full Water Tank 5,940 lbs. (2,694 kg)
Type 2" (51 mm) High Pressure Centrifugal
Maximum Flow 106 GPM (401 LPM)
Maximum Head 230 ft (29 meters)
Maximum Pressure 100 psi (690 kPa)
Material Formed Steel Channel Frame
Number of Axles 2
Capacity - Axle Rating 3,500 lbs. (1,567 kg) ea.
Tires ST205/75D 14"
Certifications DOT
Brakes (Model WT5HP/ WT5HPSG) Surge Hydraulic-Actuated Drum Brakes
Brakes ( Model WTE5HP) Electric-Actuated Drum Brakes
Hitch 2-5/16" ball or 3" pintle
Water Operations
Jack 2,000 lbs. (907 kg)
Hose Bin Formed Steel
Pressurized 1.5" and 2" Left/2" Right
1” X 50’ Hose Reel Mounted
Delivery Methods
Fill Methods
Three Std. Garden Hose Adapters:
Adapter #1 Pressurized (Upper)
Adapter #2 Drain Only (Lower)
Pressurized Rear Spray Nozzles
Municipal Fire Hydrant Steel Pipe - QD
1.5" and 2" QD Cam and Groove Adapter
Three Std. Garden Hose Adapters
PAGE 10 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
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SPECIFICATIONS (ENGINE)
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Table 2. Specifications (Engine)
Model Honda GX160U1TX2NH1
Type
Bore X Stroke 2.7 X 1.8 in. (69 X 46 mm)
Displacement 9.9 cu-in. (163 cc)
Max. Output 5.5 H.P. @ 3600 RPM
Fuel Tank Capacity 0.82 U.S. Gallons (3.1 Liters)
Fuel Unleaded Gasoline
Fuel Consumption - @ 3600 rpm 0.46 GPH (1.74 LPH)
Lube Oil Capacity 0.61 qt. 0.6 liters
Oil Type
Speed Control Method Centrifugal Flyweight Type
Cooling System Forced Air
Starting Method Recoil Start
Spark Plug Type BPR6ES NGK
Spark Plug Gap 0.028-0.031 in. (0.70 - 0.80 mm)
Dimensions (L x W x H) 12.0 X 14.4 X 13.2 in. (305 X 366 X 335 mm)
Dry Net Weight 33.0 lbs. (15 Kg.)
Air-cooled 4 stroke, Single Cylinder, OHV,
Horizontal Shaft Gasoline Engine
4-Stroke API, SF or SG
SAE 10W-30 General Use
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 11
Page 12
REAR VIEW
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DIMENSIONS
E
FRONT VIEW
B
D
C
Q
Reference
Letter
L
M
Dimension
in (mm)
A
SIDE VIEW
Ref
erence
Letter
N
K
Figure 1. Dimensions
Table 3. Dimensions
Dimension
in (mm)
Reference
Letter
F
O
Dimension
in (mm)
Reference
Letter
G
I
H
J
Dimension
in (mm)
A 69.50 (1,765) E 60.50 (1,537) I 80.00 (2,032) M 18.70 (475)
B 47.25 (1,200) F 64.00 (1,626) J 25.00 (635) N 31.5 (800)
C 58.00 (1,473) G 8.00 (203) K
D 20.00 (508) H 46.5 (1,181) L 22.70 (577)
For total length add approximately 3.5 in. (90 mm) for coupler length.
1
142.50 (3,619)
PAGE 12 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
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GENERAL INFORMATION
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APPLICATION
Typical applications for the Multiquip's High Pressure
Water Trailers include: dust control, emergency fire fighting
response, construction, agricultural-irrigation support, and
high jetting equipment wash down.
The WT5HP/WTE5HP are industrial 525-gallon Water
Trailers. Each water trailer comes with a high pressure
centrifugal pump, flexible suction/discharge manifold
system, industrial hose reel assembly with simple valve
controls, and a rugged polypropylene water tank
Manifold Delivery System
1.5" CAM and groove QD
2.0" CAM and groove QD left and right sides (discharge)
2.0" CAM and groove QD water tank fill (suction)
1” x 50’ Hose on mounted Hose Reel
3-position manifold control lever Off-Suction-Discharge
2-position spray bar control lever On-Off
Three 3/4" garden hose bibs
Water Tank
Water tank capacity is 525 gallons (1,987 liters). Tank is
made of durable 1/4" wall polyethylene with integrated
baffles to reduce water movement during transportation.
Water tank can be quickly filled via 2” diameter steel pipe
with 2" QD coupler or vented 12” diameter port. In addition,
water tank has a rear spray bar that operates under
pressurized or gravity feed settings.
Additional features also include three standard garden hose
valves (fill/discharge and tank drain).
Hose Reel Assembly
The Water Trailer comes standard with the MQ WT5HR
industrial Hose Reel Assembly installed. The reel holds
the 1” x 50’ construction grade reinforced hose and fire
fog-nozzle that is rated at 200 psi. Anytime the Water Trailer
Main Manifold in is the discharge position, the Hose Reel
will be active.
Trailer and Frame
The trailer is a DOT-approved, double-axle trailer. Trailers
can be ordered with either a standard hydraulic surge brake
system or electric brake system. Trailers can be configured
with various hitch options.
Pump
The Multiquip QP205SHLF Centrifugal Pump, which is used
in conjunction with the water trailer, is a wet priming pump
and has the capability to pump at a rate of approximately
106 gallons/minute (gpm) or 400 liters/minute (lpm) at a
maximum pressure of 100 psi (690 kPa).
Centrifugal wet priming (self priming pumps) are designed
create a partial vacuum in the pump body.
The reduced atmospheric pressure inside the pump allows
water to flow through the suction line and into the pump
body. The centrifugal force created by the rotating impeller
pressurizes the water and expels it from the pump.
This centrifugal pump should only be used in clear water
applications (agricultural, industrial, residential) as it only
has a limited solid handling capability of only 10% by
volume.
Elevation
Higher elevations will affect the performance of the pump.
Due to less atmospheric pressure at higher altitudes,
pumps DO NOT have the priming ability that they have at
sea level. This is due to the “thinner air” or lack of oxygen
at higher altitudes.
Power Plant
The centrifugal pump, used by the water trailer, is powered
by a 3.5 horsepower, air- cooled, 4-stroke, single-cylinder,
HONDA GX160 gasoline engine that incorporates a low
“Oil Alert Feature.”
Oil Alert Feature
In the event of low oil or no oil, the HONDA GX160 engine
has a built-in oil shut-down feature. In the event the oil
level is low the engine will automatically shut down and
cannot be restarted until the oil level is brought up to a
safe operating level.
Accessories (Optional Items)
Suction Hose - NPT Thread
Suction Hose - Quick Disconnect Coupler
Discharge Hose - NPT Thread
Discharge Hose - Quick Disconnect Coupler
Discharge Hose - Fire Hydrant
Aluminum Couplers - QD
For convenience, a formed steel hose bin has been
provided for the storage of hoses and accessories during
transport.
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 13
Fire Hose Nozzle
Contact your nearest Multiquip dealer for any hoses or
accessories that you may need.
Page 14
COMPONENTS (WATER TRAILER)
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24
25
26
27
1
2
18
19
23
22
21
20
17
15
10
16
3
13
14
4
12
11
6
8
7
9
5
Figure 2. Water Trailer Components
PAGE 14 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
Page 15
COMPONENTS (WATER TRAILER)
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1. Water Tank — Capacity is 525 gallons (1,987 liters).
Fill with clean water with no debris.
2. Water Tank Fill Pipe — 2” diameter steel pipe. Connect
the 2" QD coupler end of this pipe to a fire hydrant.
An interface hose will be required to connect from the
pipe's QD coupler to the fire hydrant.
3. Water Tank Cap — Remove this cap (12-inch diameter
fill port) to fill water tank if using a fire hydrant type
method.
4. Document Box — Storage for documentation and
other information regarding the water trailer.
5. Tires — This water trailer uses ST205/75D 14" size
tires. Replace with only recommended type tires. Never
tow water trailer with bad or worn tires.
6. Low Point Drain Valve — A standard garden hose bib
located underneath manifold.
7. Manifold Control Handle — 3-position handle. Allows
3 different modes of operation, off, discharge or
suction.
8. VIN Tag/Serial Number — This is the formal VIN Tag.
The last 6 numbers of the VIN Tag represents the unit’s
serial number.
9. Garden Hose Drain Valve — When draining of the
water tank is required open this valve to drain water.
10. In-line Partial Strainer Valve — This in-line filter
provides quick and easy access to the suction side
strainer that can capture large debris that could have
been ingested while drawing water from natural water
sources. It is not intended to allow for the suction of
heavy debris-laden water.
11. 2.0" CAM and Groove Male QD Port — This port
(right-side) can be used as either a suction or discharge
port depending on the placement of the manifold
control handle.
12. 1.5" CAM and Groove Male QD Port — This port can
be used as either a suction or discharge port depending
on the placement of the manifold control handle.
13. Spray Bar Control Handle — 2-position handle, allows
spray bar to be turned either on or off.
14. Garden Hose Valve — When other options of filling
of the water tank are unavailable, a garden hose can
be connected to this valve to fill the water tank. A rigid
walled garden hose or suction type garden hose must
be used for this purpose.
In addition this valve can be used as a discharge port
depending on the position of the manifold control lever.
See Table 5.
15. Fill Cap — Prior to operation, the pump casing must
be filled with water. Remove this cap to add water to
the pump. After the initial prime, a sufficient amount of
water will be retained in the casing so that the operator
will not need to re-prime later.
16. Drain Plug — Remove this plug to drain water from
the pump.
17. Hydraulic Brake Actuator — This actuator
(Model WT5HP only) will be activated in the event of
a breakaway. The breakaway cable must be rigged to
the tow vehicle with appropriate slack that will activate
the system if the coupler connection comes loose.
18. Coupler Adapters — Reference Coupler Types
section under Trailer Guidelines. See page 42.
19. Electric Brake Actuator — This actuator (Model
WTE5HP only) will be activated in the event of a
breakaway. The breakaway cable must be rigged to the
tow vehicle with appropriate slack that will activate the
system if the coupler connection comes loose.
20. Engine — This water trailer uses a Honda GX160, 5.5 HP
air cooled 4-stroke, single cylinder gasoline engine.
21. 2.0" CAM and Groove Male QD Port — This port
(left-side) can be used as either a suction or discharge
port depending on the placement of the manifold
control handle.
22. Dust Cap — There are 3 dust caps that are used with
the manifold system. These caps prevent dirt and
debris from entering the water system and cap-off
the ports when the suction/discharge hoses are not
connected.
23. Hose Reel — Used for extracting water hose.
24. Storage Bin — Place hoses and accessories in this
bin during transport.
25. Spray Nozzles — Located at the rear of the water
trailer are two water spray nozzles. These nozzles can
operate under multiple pressure settings.
26. License Light — This light illuminates the license plate.
Whenever towing of the light tower is required, make
sure this light is operational.
27. Brake Lights — Before towing the water trailer, make
sure that these lights are operational and are working
correctly. Never tow the water trailer if these lights are
inoperative.
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 15
Page 16
BASIC ENGINE
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1
9
7
8
6
12
11
Figure 3. Engine Components
2
10
3
5
4
INITIAL SERVICING
The engine (Figure 3) must be checked for proper
lubrication and filled with fuel prior to operation. Refer to the
engine manufacturer’s manual for instructions and details
of operation and servicing.
1. Fuel Filler Cap — Remove this cap to add unleaded
gasoline to the fuel tank. Make sure cap is tightened
securely. DO NOT over fill.
DANGER
Adding fuel to the tank should be done
only when the engine is stopped and has
had an opportunity to cool down. In the
event of a fuel spill, DO NOT attempt to
start the engine until the fuel residue has
been completely wiped up, and the area surrounding
the engine is dry.
2. Throttle Lever — Used to adjust engine RPM speed
(lever advanced forward SLOW, lever back toward
operator FAST).
3. Engine ON/OFF Switch — ON position permits engine
starting, OFF position stops engine operations.
4. Recoil Starter (pull rope) — Manual-starting method.
Pull the starter grip until resistance is felt, then pull
briskly and smoothly.
5. Fuel Valve Lever — OPEN to let fuel flow, CLOSE to
stop the flow of fuel.
6. Choke Lever — Used in the starting of a cold engine,
or in cold weather conditions. The choke enriches the
fuel mixture.
7. Air Cleaner — Prevents dirt and other debris from
entering the fuel system. Remove wing-nut on top of
air filter canister to gain access to filter element.
NOTICE
Operating the engine without an air filter, with a
damaged air filter, or a filter in need of replacement
will allow dirt to enter the engine, causing rapid engine
wear.
WARNING
Engine components can generate extreme
heat. To prevent burns, DO NOT touch
these areas while the engine is running or
immediately after operating. NEVER operate
the engine with the muffler removed.
8. Spark Plug — Provides spark to the ignition system.
Set spark plug gap to 0.6 - 0.7 mm (0.028 - 0.031 inch)
Clean spark plug once a week.
9. Muffler — Used to reduce noise and emissions.
10. Fuel Tank — Holds unleaded gasoline. For additional
information refer to engine owner's manual.
PAGE 16 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
Page 17
BEFORE STARTING
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1. Read all safety instructions at the beginning of manual.
INSPECTION (ENGINE)
2. Clean the unit, removing dirt and dust, particularly the
engine cooling air inlet, carburetor and air filter.
3. Check the air filter for dirt and dust. If air filter is dirty,
replace air filter with a new one as required.
4. Check carburetor for external dirt and dust. Clean with
dry compressed air.
5. Check fastening nuts and bolts for tightness.
ENGINE OIL CHECK
1. To check the engine oil level, place the unit on secure
level ground with the engine stopped.
2. Remove the filler dipstick from the engine oil filler hole
(Figure 4) and wipe it clean.
DIPSTICK
UPPER LIMIT
LOWER LIMIT
Figure 5. Engine Oil Dipstick (Oil Level)
FUEL CHECK
DANGER
Motor fuels are highly flammable and can be
dangerous if mishandled. DO NOT smoke
while refueling. DO NOT attempt to refuel if
the engine is hot or running.
1. Remove the gasoline cap located on top of fuel tank.
2. Visually inspect to see if fuel level is low. If fuel is low,
replenish with unleaded fuel.
Figure 4. Engine Oil Dipstick (Removal)
3. Insert and remove the dipstick without screwing it into
the filler neck. Check the oil level shown on the dipstick.
4. If the oil level is low (Figure 5), fill to the edge of the
oil filler hole with the recommended oil type (Table 4).
Maximum oil capacity is 0.63 quarts (0.6 liters).
Table 4. Oil Type
Season Temperature Oil Type
Summer 25°C or Higher SAE 10W-30
Spring/Fall 25°C ~ 10°C SAE 10W-30/20
Winter 0°C or Lower SAE 10W-10
NOTICE
Refer to engine manufacturer’s manual for specific
servicing instructions.
FUEL
CAP
Figure 6. Fuel Level Check
3. When refueling, be sure to use a strainer for filtration.
DO NOT top-off fuel. Wipe up any spilled fuel.
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 17
Page 18
INSPECTION (PUMP IN-LINE MESH FILTER)
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INSPECTING/CLEANING THE IN-LINE FILTER
SYSTEM
This water trailer utilizes a high pressure centrifugal pump
which operates a fully closed impeller system. Pump
performance can be negatively affected if the fully enclosed
impeller system becomes clogged due to an accumulation
of dirt, sand, and general debris.
NOTICE
Failure to regularly check/clean out the in line mesh filter
can result in loss of performamce of the high pressure
pump and damage to the impeller system.
When drawing water from sources that may include a
degree of sediment, debris, and sandy particles, it is
necessary to regularly check and clean-out the in-line filter
that is located adjacent to the pump casing (Figure 7).
The stainless steel screen within the filter is easily inspected
or cleaned by loosening the strainer ring (Figure 7A) and
separating the parts to extract the mesh filter screen
(Figure 7C) for inspection and cleaning.
Once the screen has been inspected or cleaned, ensure
that the strainer ring and gasket (Figure 7B)is securely
retightened onto the strainer body (Figure 7D).
IN-LINE FILTER
BODY
SCREEN
MESH FILTER
GASKET
Figure 7. Inspecting/Cleaning In-Line Water Filter
RING
D
B
A
C
PAGE 18 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
Page 19
OPERATION
FUEL VALVE
LEVER
ON
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STARTING THE ENGINE
1. Place the manifold control handle in the vertical position
(OFF). See Table 5.
2. Place the engine fuel valve lever (Figure 8) to the ON
position.
4. Place the choke lever (Figure 10) in the CLOSED
position if starting a cold engine.
CHOKE LEVER
CLOSED
Figure 10. Engine Choke Lever (Closed)
5. Place the choke lever (Figure 11) in the OPEN position
if starting a warm engine or the temperature is warm.
Figure 8. Engine Fuel Valve Lever (ON Position)
3. Move the throttle lever (Figure 9) away from the slow
position, about 1/3 of the way toward the fast position.
THROTTLE LEVER
1/3
RUN
Figure 9. Throttle Lever (1/3 Start Position)
IDLE
CHOKE LEVER
CLOSED
Figure 11. Engine Choke Lever (Open)
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 19
Page 20
OPERATION
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6. Place the engine ON/OFF switch (Figure 12) in the
ON position.
ON
ENGINE SWITCH
Figure 12. Engine ON/OFF Switch (ON Position)
7. Grasp the starter grip (Figure 13) and slowly pull it
out. The resistance becomes the hardest at a certain
position, corresponding to the compression point. Pull
the starter grip briskly and smoothly for starting.
8. If the engine has started, and the choke lever was
moved to the CLOSED position to start the engine,
gradually move the choke lever to the OPEN position
(Figure 11) as the engine warms up. If the engine has
not started repeat steps 1 through 6.
9. Before the water trailer is placed into operation, run
the engine for several minutes.
10. Check for fuel leaks and noises that would be
associated with a loose component. Check for leaks
between pump and engine. If water is leaking between
the pump and engine housing, the seal inside the
pump may be worn or damaged. Continued operation
of the pump is not recommended. Further usage of the
pump under these conditions may cause severe water
damage to engine.
11. To begin pumping, place the throttle lever (Figure 14)
in the RUN position.
STARTER GRIP
Figure 13. Starter Grip
THROTTLE LEVER
RUN
Figure 14. Throttle Lever (Run).
12. Set manifold and spray bar control handles as
referenced in Table 5 to activate pumping.
PAGE 20 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
Page 21
OPERATION
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Stopping The Engine
Normal Shutdown
1. Move the throttle lever to the IDLE position (Figure
15) and run the engine for three minutes at low speed.
THROTTLE LEVER
IDLE
Figure 15. Throttle Lever (Idle)
2. After the engine cools, turn the engine ON/OFF switch
to the OFF position (Figure 16).
Figure 16. Engine ON/OFF Switch (OFF Position)
3. Place the fuel shut-off lever (Figure 17) in the OFF
position.
FUEL VALVE
LEVER
OFF
Figure 17. Fuel Valve Lever (OFF)
Emergency Showdown
1. Move the throttle lever quickly to the IDLE position, and
place the engine ON/OFF switch in the OFF position.
OFF
ON
ENGINE SWITCH
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 21
Page 22
Reference Figure 18 and Table 5 for the various control
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handle operating positions when using the Manifold and
Spray Bar Control Handles.
POSITION B
OPERATION
POSITION A
SPRAY BAR
CONTROL HANDLE
MANIFOLD
CONTROL HANDLE
POSITION 2
Operational
Engine Start/Parked
Suction
Discharge
Discharge/Spray
Spray Only
Dust Caps Attached
o All 3 Ports
T
RIGHT
LEFT
Figure 18. Pump Control Handles
Table 5. Pump Control Handle Operation
Manifold
Control Handle
Position 1
(Vertical)
Position 2
(Horizontal/Left)
Position 3
(Horizontal/Right)
Position 3
(Horizontal/Right)
Position 3
(Horizontal/Right)
Manif
old
Couplers
OFF
ON
ON
ON
ON
POSITION 3
POSITION 1
Spray Bar
Control Handle
osition B
P
(Horizontal)
osition B
P
(Horizontal)
osition B
P
(Horizontal)
osition A
P
(Vertical)
P
osition A
(Vertical)
Rear
Spray
OFF
OFF
OFF
ON
ON
PAGE 22 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
Page 23
OPERATION
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There is an operating mode (Figure 19) that could be
harmful to your water pump. Never operate the water trailer
with the spray bar control handle in the vertical position (rear
spray on), and the manifold control handle in the horizontal
position (suction/left) with the engine running.
This mode of operation with no hoses attached causes the
pump to draw in air creating unnecessary back pressure.
Never operate the water trailer in this mode.
The recommended operating modes of the water trailer
are shown in Table 5.
NOTICE
NEVER operate the water trailer with the spray bar and
manifold control handles as shown in Figure 19.
This mode of operation with the engine running causes
the pump to draw in air, creating unnecessary back
pressure.
NOTICE
Prior to engine start, the pump MUST BE primed. This
is accomplished by removing the Pump Fill Cap and
filling the Pump Casing with water and then re-securing
the fill cap.
SPRAY BAR
CONTROL HANDLE
ENGINE ON
MANIFOLD
CONTROL HANDLE
DRAWING
AIR IN ONLY
Figure 19. Do Not Use Mode (Engine On)
DRAWING
AIR IN ONLY
LEFT
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 23
Page 24
OPERATION
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FILLING THE WATER TANK (FIRE HYDRANT)
1. Remove the water tank cap.
2. Attach hydrant adapter to fire hydrant if necessary.
3. Attach fire hydrant discharge hose between the 2" steel
water tank pipe QD port and the fire hydrant.
4. Make sure there are no bends or sharp kinks in the
hose between the fire hydrant and water tank fill port.
2” DIA.
STEEL PIPE
5. Slowly open the hydrant valve. Water tank should
begin to fill.
6. Fill the water tank to the desired level and close the
fire hydrant valve.
7. Remove fire hydrant discharge hose and allow the hose
to drain. Remove the hydrant adapter.
NOTICE
Prior to engine start, the pump MUST BE primed. This
is accomplished by removing the Pump Fill Cap and
filling the Pump Casing with water and then re-securing
the fill cap.
WATER TANK
FILL PORT
(2” QD
MALE COUPLER)
WATER TANK
CAP
FIRE HYDRANT
DISCHARGE
HOSE
FIRE HYDRANT
Figure 20. Fire Hydrant Connection
PAGE 24 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
Page 25
OPERATION
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FILLING THE WATER TANK (WATER SOURCE)
1.5 or 2.0" CAM and Groove Male QD Port
The following procedures shows how to fill the water tank
using a swimming pool, pond, lake, river etc. as a water
source. Reference Figure 21.
1. Remove the dust cap from the desired CAM and groove
male QD port from the upper manifold.
2. Connect suction hose between desired port (1.5" or
2.0") and water source.
3. Place spray bar and manifold control handles in the
suction position as referenced in Table 5.
4. Fill the water tank to the desired level.
5. To stop water flow place manifold control handle in
OFF position (vertical).
6. Remove suction hose.
7. Install dust cap back onto male QD port.
GARDEN HOSE
1. Connect garden hose between garden hose valve
and water source. Garden hose must be an industrial
reinforced 3/4" water hose.
2. Open garden hose valve.
3. Place spray bar and manifold control handles in suction
position as referenced in Table 5.
4. Fill the water tank to the desired level.
5. To stop water flow place manifold control handle in
OFF position (vertical).
6. Close garden hose valve.
7. Remove garden hose.
NOTICE
DO NOT pump heavy-debris-laden water. Ensure the
suction hose is tethered in a manner that will keep the
suction end off the bottom of ponds, lakes, rivers, etc.
TYPICAL APPLICATION
2” CAM &
GROOVE MALE
QD COUPLER
SUCTION
HOSE
GARDEN HOSE
VALVE
NOTICE
Prior to engine start, the pump MUST BE primed. This
is accomplished by removing the Pump Fill Cap and
filling the Pump Casing with water and then re-securing
the fill cap.
WATER SOURCE
RIGID WALL
GARDEN HOSE OR
SUCTION TYPE
GARDEN HOSE
REQUIRED
Figure 21. Filling Water Tank (Water Source)
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 25
Page 26
OPERATION
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DISCHARGING WATER
The following processes demonstrate how to discharge
water from: the Cam and Groove Ports from the main
manifold, the rear spray bar assembly, and the hose bib
ports.
Left/Right Cam and Groove Ports
1. Remove the dust cap(s) of those port(s) if you wish to
discharge water.
2. Ensure the Hose Bib couplers have been turned to
the OFF position.
3. Ensure the Rear Spray Bar Control Handle is in
the 9 O’clock (OFF) position.
4. Place the Main Manifold Control Handle in the
3 O’clock position.
2.0” CAMA ND
FRONT
2.0” CAMA ND
GROOVE MALE QD
GROOVE MALE QD
Rear Spray Bar Assembly
1. Ensure all Main Manifold dust cap(s) are secured on
the male couplers.
2. Ensure the Hose Bib couplers have been turned to
the OFF position.
3. Ensure the Rear Spray Bar Control Handle is in
the 12 O’clock (ON) position.
Hose Bib(s)
1. Ensure all Main Manifold dust cap(s) are secured on
the male couplers.
2. Ensure the Rear Spray Bar Control Handle is in the
9 O’clock (OFF) position.
3. Turn the Hose Bib(s) you desire discharge from to the
ON position.
NOTICE
Prior to engine start, the pump MUST BE primed. This
is accomplished by removing the Pump Fill Cap and
filling the Pump Casing with water and then re-securing
the fill cap.
REAR
SPRAY
Figure 22. Discharging Water
PAGE 26 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
SPRAY
Page 27
WINTERIZING PROCEDURE
DRAIN PLUG
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WINTERIZING
Perform the following procedure to protect water trailer from
component damage in freezing temperature environments.
1. Make sure the water tank is completely empty. Use
pump to remove any water present in the water tank.
2. Place unit on a level surface and raise trailer tongue
by placing front jack stand to the highest position
(Figure 23).
TRAILER
TONGUE
FRONT
JACK STAND
(HIGHEST
POSITION)
4. Rotate the manifold control handle to the 3 o'clock
position (horizontal/right). See Figure 25.
5. Rotate the spray bar control handle to the 12 o'clock
position (vertical). See Figure 25.
SPRAY BAR
CONTROL HANDLE
GARDEN HOSE BIB
GARDEN HOSE BIB
MANIFOLD
CONTROL HANDLE
Figure 23. Raising Trailer Tongue
3. Locate and remove Pump Case Cover drain plug on
pump end (Figure 24).
PUMP CASE
Figure 24. Removing Drain Plug
Figure 25. Control Handle Positions and
Garden Hose Bibs Location
6. Locate and open all three garden hose bibs (parallel
with pipe position) and leave open. See Figure 25 and
Figure 26.
UNDER
WATER TRAILER
(NEAR ENGINE)
GARDEN HOSE
BIB
Figure 26. Third Garden Hose Bib Location
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 27
Page 28
WINTERIZING PROCEDURE
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7. Once water appears to have all been drained, lower
front trailer tongue by lowering front jack stand to the
lowest position (Figure 27).
TRAILER
TONGUE
FRONT
JACK STAND
(LOWEST
POSITION)
9. Once fluid has stopped draining, reinstall the drain
plug on pump end.
NOTICE
It is important to cycle the manifold control handle from
the 3 o'clock position then back to 9 o'clock position
to allow all water to drain from the entire manifold valve
assembly.
NEVER leave the manifold control handle in the
12 o'clock or 6 o'clock position.
ALWAYS leave the spray bar control handle in the
12 o'clock position.
Figure 27. Lowering Trailer Tongue
8. Rotate the manifold control handle to the 9 o'clock
position (horizontal/left) and leave it there (Figure 28).
LEFT
MANIFOLD
CONTROL HANDLE
Figure 28. Manifold Control Handle Position
PAGE 28 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
Page 29
MAINTENANCE
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PUMP VACUUM TEST
CAUTION
DO NOT attempt to start the engine unless the pump
has previously been primed with water. Severe pump
damage will occur if pump has not been primed.
To perform the pump vacuum test do the following:
1. Remove the pump fill cap and fill the pump with water.
2. Start the engine as outlined in the operation section,
and wait for the pump to begin pumping.
3. As shown in Figure 29, place a water hose inside
the discharge opening of the pump, and turn on the
water. This flow of water into the discharge opening
will prevent the pump from running dry.
4. Place the Pump Vacuum Tester (P/N 7000030) over the
pump suction (inlet) opening with the vacuum gauge
facing upwards. It may be necessary to apply a small
amount of water around the rubber seal of the vacuum
tester to make a good suction fit.
DISCHARGE PORT
ACCEPTABLE
READING SHOULD BE
BETWEEN
-25 AND -20 IN. Hg.
PLACE
VACUUM TESTER
OVER PUMP
SUCTION PORT
25 IN. Hg.
TRANSLATES
INTO 25 FEET
OF LIFT AT
SEA LEVEL
5. Check and make sure that there are no air leaks
between the vacuum tester and the inlet port on the
pump. If air leaks are present reset vacuum tester.
6. Run the pump for a few minutes while monitoring
the vacuum gauge. If the gauge indicates a reading
between -25 and -20 in. Hg. (inches of mercury) then
it can be assumed that the pump is working correctly.
7. If the vacuum tester gauge indicates a reading below
-20 in. Hg, it can then be assumed that the pump is
not functioning correctly, and corrective action needs
to be taken.
NOTICE
25 in. Hg (inches of mercury) translates into 25 feet of
lift at sea level.
Figure 29. Pump Vacuum Test
NOTICE
Vacuum test may be performed without water flowing
through the discharge port. However, it is recommended
to have water flowing to prevent any heat-up.
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 29
Page 30
MAINTENANCE
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Use Table 6 as a general maintenance guideline when servicing your engine. For more detail engine maintenance information,
refer to the engine owner’s manual supplied with your engine.
Table 6. Engine Maintenance Schedule
DESCRIPTION
(3)
Engine Oil
Air Cleaner
All Nuts and
Bolts
Spark Plugs
Cooling Fins Check X
Spark Arrester Clean X
Fuel Tank Clean X
Fuel Filter Check X
Idle Speed
OPERATION BEFORE
Check X
Change X
Check X
Change X (1)
Re-tighten if
necessary
Check/Clean X
Replace X
Check/
Adjust
X
FIRST
MONTH OR
10 HRS.
EVERY 3
MONTHS
OR 25 HRS.
EVERY 6
MONTHS
OR 50 HRS.
EVERY
YEAR
OR 100
HRS.
X (2)
EVERY 2
YEARS OR
200 HRS.
Valve
Clearance
Fuel Lines Check Every 2 years (replace if necessary) (2)
(1) Service more frequently when used in DUSTY areas.
(2) These items should be serviced by your service dealer, unless you have the proper tools and are mechanically
proficient. Refer to the HONDA Shop Manual for service procedures.
(3) For commercial use, log hours of operation to determine proper maintenance intervals.
Check/
Adjust
X (2)
PAGE 30 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
Page 31
MAINTENANCE
BOLT
CAP DIPSTICK
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Perform the scheduled maintenance procedures as defined
by Table 6 and below:
DAILY
Thoroughly remove dirt and oil from the engine and
control area. Clean or replace the air cleaner elements
as necessary. Check and retighten all fasteners as
necessary. Check the gearbox for oil leaks. Repair or
replace as needed.
WEEKLY
Remove the fuel filter cap and clean the inside of the
fuel tank.
Remove or clean the filter at the bottom of the tank.
Remove and clean the spark plug (Figure 30), then adjust
the spark gap to 0.024 ~0.028 inch (0.6~0.7 mm). This
unit has electronic ignition, which requires no adjustments.
ENGINE OIL
1. Drain the engine oil when the oil is warm as shown in
Figure 31.
OIL FILLER
SEALING
WASHER
DRAIN
Figure 31. Engine Oil (Draining)
2. Remove the oil drain bolt and sealing washer and allow
the oil to drain into a suitable container.
3. Replace engine oil with recommended type oil as
listed in Table 4. For engine oil capacity, see Table 1
(Specifications). DO NOT overfill.
4. Install drain bolt with sealing washer and tighten
securely.
GAP: 0.024 - 0.028 in.
(0.6 - 0.7 mm.)
Figure 30. Spark Plug Gap
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 31
Page 32
MAINTENANCE
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ENGINE AIR CLEANER
1. Remove the air cleaner cover and foam filter element
as shown in Figure 32.
2. Tap the paper filter element (Figure 32) several times
on a hard surface to remove dirt, or blow compressed
air [not exceeding 30 psi (207 kPa, 2.1 kgf/cm2)]
through the filter element from the air cleaner case
side. NEVER brush off dirt. Brushing will force dirt
into the fibers. Replace the paper filter element if it is
excessively dirty.
3. Clean foam element in warm, soapy water or
nonflammable solvent. Rinse and dry thoroughly. Dip
the element in clean engine oil and completely squeeze
out the excess oil from the element before installing.
DANGER
DO NOT use gasoline as a cleaning solvent to avoid
creating the risk of fire or an explosion.
BLOW COMPRESSED
AIR FROM THE
INSIDE OUT
STORAGE
For storage of the unit for over 30 days, the following is
required:
Drain the fuel tank completely.
Run the engine until the fuel in the carburetor is
completely consumed.
Completely drain used oil from the engine crankcase
and fill with fresh clean oil, then follow the procedure
described in the engine manual for engine storage.
Remove the drain plug from the pump and drain out any
water from left in the housing.
Remove the pump cover and clean inside of pump
housing. Coat inside of pump housing with a light film
of oil to reduce corrosion. A spray can of oil works well
for this application.
Cover pump and engine with plastic covering or
equivalent and store in a clean, dry place.
To protect the water-cooled seals, place one-half pint
of lubricating oil (new or used) through the discharge
opening on the pump and crank the engine several times.
This will prevent excessive corrosion and also keep the
mechanical seal lubricated.
WING NUT
AIR CLEANER
COVER
FOAM FILTER
ELEMENT
GASKET
Figure 32. Engine Air Cleaner
PAPER FILTER
ELEMENT
Drain water tank completely.
PAGE 32 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
Page 33
MAINTENANCE
Discount-Equipment.com
The following trailer maintenance guidelines are intended
to assist the operator in preventive maintenance.
TRAILER BRAKES
Properly functioning brake shoes and drums are essential
to ensure safety. The brakes should be inspected the first
200 miles of operation. This will allow the brake shoes and
drums to seat properly. After the first 200 mile interval,
inspect the brakes every 3,000 miles. If driving over rough
terrain, inspect the brakes more frequently.
HYDRAULIC BRAKES
If your trailer has hydraulic brakes, they function the same
way the surge brakes do on your tow vehicle. The hydraulic
braking system must be inspected at least as often as the
brakes on the tow vehicle, but no less than once per year.
This inspection includes an assessment of the condition
and proper operation of the wheel cylinders, brake shoes,
brake drums and hubs.
MANUALLY ADJUSTING THE BRAKES
Most axles are fitted with a brake mechanism that will adjust
the brakes during a hard stop. However, some braking
systems are not automatically adjusted by hard stopping.
These brakes require manual adjustment. The following
steps apply to adjust most manually adjustable brakes.
1. Jack up the trailer and secure it on adequate capacity
jack stands.
6. Replace the adjusting-hole cover.
7. Repeat the above procedure on all brakes.
8. Lower the trailer to the ground.
Check the fluid level in the master cylinder reservoir at least
every three months. If you tow your trailer an average of
1,000 miles per month in a hot and dry environment, you
must check the brake fluid level once a month. The brake
fluid reservoir is located on the tongue of the trailer. Always
fill with clean, uncontaminated DOT 4 brake fluid.
Figure 33 below displays the major hydraulic brake
components that will require inspection and maintenance.
Please inspect these components as required using steps
1 through 6 as referenced in the “Manually Adjusting The
Brakes” section on this page. See Table 7 for Hydraulic
Brake Troubleshooting.
Retractor
Backing
Plate
Secondary
Shoe
Adjuster
Spring
Spring
Anchor Post
Adjuster
Assembly
Hydraulic Wheel
Cylinder
Actuating Pin
Primary
Shoe
Hold
Down
Spring
2. Be sure the wheel and brake drum rotate freely.
3. Remove the adjusting-hole cover from the adjusting
Figure 33. Hydraulic Brake Components
HYDRAULIC BRAKE ACTUATOR
slot on the bottom of the brake backing plate.
The hydraulic brake actuator (Figure 34) is the mechanism
4. With a screwdriver or standard adjusting tool, rotate the
starwheel of the adjuster assembly to expand the brake
shoes. Adjust the brake shoes out until the pressure
of the linings against the drum makes the wheel very
difficult to turn. Note: Your trailer maybe equipped with
drop spindle axles. See axle manual for your axle type.
You will need a modified adjusting tool for adjusting
that activates the trailer’s brake system. This actuator
changes fluid power into mechanical power. Therefore, the
fluid level must be checked frequently to assure that the
brakes function properly.
HYDRAULIC
BRAKE FLUID
RESERVOIR
the brakes in these axles. With drop spindle axles, a
modified adjusting tool with about an 80 degree angle
should be used.
5. Rotate the starwheel in the opposite direction until the
wheel turns freely with a slight drag.
Figure 34. Hydraulic Brake Actuator
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 33
Page 34
MAINTENANCE
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WARNING
Failure to maintain proper fluid level in the actuator
may result in loss of braking action which could cause
severe property damage, injury or death.
Periodically check the actuator mounting fasteners for
damage or loosening. Inspect the actuator for worn or
damaged parts. As you are towing your trailer, be aware
of any changes in braking quality. This could be an early
warning of brake or actuator malfunction and requires
immediate attention. Consult a certified brake specialist to
make necessary adjustment or repairs.
Table 7. Hydraulic Brake Troubleshooting
Symptom Possible Cause Solution
No Brakes Brake line broken or kinked? Repair or replace.
Brake lining glazed? Reburnish or replace.
Trailer overloaded? Correct weight.
Weak Brakes or
Brakes Pull to
One Side
Locking Brakes
Noisy Brakes
Dragging
Brakes
Brake drums scored or
grooved?
Tire pressure correct? Inflate all tires equally.
Tires unmatched on the
same axle?
Brake components loose,
bent or broken?
Brake drums out-of-round? Replace.
System lubricated? Lubricate.
Brake components correct? Replace and correct.
Brake lining thickness
incorrect or not adjusted
correctly?
Enough brake fluid or correct
fluid?
Machine or replace.
Match tires.
Replace components.
Install new shoes and
linings.
Replace rubber parts
fill with dot 4 fluid.
Brake system has very little lag time between the time
the vehicle’s brakes are actuated and the trailer’s brakes
are actuated.
Brake system can provide an independent emergency
brake system.
The model WTE5C (electrtic brake) comes standard with
a 6-pin connector for tow vehicle electrical hook-up. If
a 7-pin connector is required, order WTE5C with Part
No. EE55622.
Remember in order to properly synchronize the tow vehicle’s
braking to the trailer’s braking, can only be accomplished
by road testing. Brake lockup, grabbiness or harshness is
due to lack of synchronization between the tow vehicle and
the trailer being towed or under-adjusted brakes.
Before any brake synchronizations adjustments can be
made, the trailer brakes should be burnished-in by applying
the brakes 20-30 times with approximately a 20 m.p.h.
decrease in speed, e.g. 40 m.p.h. to 20 m.p.h. Allow ample
time for brakes to cool between application. This allows
the brake shoes to slightly be seated into the brake drum
surface.
Figure 35 displays the major electric brake components that
will require inspection and maintenance. Please inspect
these components as required. See Table 8.
Retractor
Secondary
Shoe
Hold Down
Washer
Spring
Actuating Lever
Backing
Plate
ELECTRIC BRAKES
Electrically actuated brakes (Figure 35) are similar to
hydraulic brakes. The basic difference is that electric brakes
are actuated by an electromagnet. Listed below are some
of the advantages that electric brakes have over hydraulic
brakes:
Brake system can be manually adjusted to provide the
corrected braking capability for varying road and load
conditions.
Self-Adjusting
Cable
Adjuster
Spring
Adjuster
Lever
Adjuster
Assembly
Figure 35. Electrical Brake Components
Brake system can be modulated to provide more or less
braking force, thus easing the brake load on the towing
vehicle.
PAGE 34 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
Primary
Shoe
Magnet
Page 35
MAINTENANCE
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ELECTRIC BRAKE ACTUATOR
The electric brake actuator (Figure 36) is the mechanism
that activates the trailer’s brake system. For electric brake
equipped trailers, the breakaway brake system includes a
DC power source, a switch with a pull pin, and a breakaway
brake controller. Read and follow the instructions that
have been prepared by the breakaway brake controller
manufacturer.
CONNECT CABLE TO
TOW VEHICLE
BREAKAWAY SWITCH
Figure 36. Electric Brake Actuator
trying to pull the trailer with the tow vehicle, after pulling
the pin. The trailer brakes may not lock, but you will notice
that a greater force is needed to pull the trailer.
WARNING
If electric breakaway brakes do not operate when trailer
is uncoupled from the tow vehicle, death or serious
injury can occur. Check emergency breakaway brake
system BEFORE each tow.
Tow Vehicle Operated Electric Brakes
The electric brakes that operate in conjunction with the
tow vehicle brakes must be “synchronized” so that braking
is properly distributed to the tow vehicle brakes and the
trailer brakes. For proper operation and synchronization,
read and follow the axle/brake and the brake controller
manufacturers’ instructions.
To make certain an electrically-operated braking system will
function properly, you must have your dealer inspect the
magnets at least once a year, or each 12,000 miles. See the
brake manual for wear and current inspection instructions.
Electrical-operated Hydraulic
Electric/hydraulic braking systems which are mounted on
the trailer, use a small electrically-driven pump to generate
hydraulic pressure, which operates the brake cylinders.
Like electrical brakes, an electric/hydraulic braking system
is operated by an electrical signal from the tow vehicle.
BREAKAWAY BRAKE
Breakaway Battery
This battery supplies the power to operate the trailer brakes
if the trailer uncouples from the tow vehicle. Be sure to
check, maintain and replace the battery according to the
battery manufacturer’ instructions.
Breakaway Switch
This switch causes the breakaway battery to operate the
electric brakes if the trailer uncouples from the tow vehicle.
The pull cable for the pull pin is connected to the tow vehicle,
and the switch is connected to the trailer.
To check for proper functioning of the switch, battery and
brakes, you must pull the pin from the switch and confirm
that the brakes apply to each wheel. You can do this by
Table 8. Electric Brake Troubleshooting
Symptom Possible Cause Solution
No Brakes or
Intermittent
Brakes
Weak Brakes or
Brakes Pull to
One Side
Locking Brakes
Noisy Brakes
Dragging
Brakes
Any open circuits or broken
wires?
Any short circuits? Find and correct.
Faulty controller? Test and correct.
Any loose connections? Find and repair.
Ground wire secure? Find and secure.
Grease or oil on magnets or
linings?
Connections corroded?
Brake drums scored or
grooved?
Brakes synchronized? Correct.
Brake components loose,
bent or broken?
Brake drums out-of-round? Replace.
System lubricated? Lubricate.
Brake components correct? Replace and correct.
Brake lining thickness
incorrect or not adjusted
correctly?
Enough brake fluid or correct
fluid?
Find and correct.
Clean or replace.
Clean and correct cause of
corrosion.
Machine or replace.
Replace components.
Install new shoes and
linings.
Replace rubber parts
fill with dot 4 fluid.
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 35
Page 36
BOLT (5/6”x11”x5”)
BOLT
(5/6”x11”x5”)
PINTLE EYE RING
(3”)
BALL COUPLER
(2” OR 2-5/16”)
FLAT WASHER (5/8”)
ADJUSTABLE
CHANNEL
FLAT
WASHER
(5/8”)
NYLOC NUT
(5/8”)
NYLOC NUT
(5/8”)
FLAT WASHER
(5/8”)
MAINTENANCE
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ADJUSTABLE CHANNEL
Your trailer may be equipped with an adjustable channel
(Figure 37) that allows the coupler to be raised or lowered
to a desired height. Periodically check the channel bolts
for damage or loosening.
NOTICE
When replacing channel mounting hardware (nuts,
bolts and washers), NEVER substitute substandard
hardware. Pay close attention to bolt length and grade.
ALWAYS use manufacturer's recommended parts
when replacing channel mounting hardware.
If the trailer has not been used for an extended amount
of time, have the bearings inspected and packed more
frequently, at least every six months and prior to use.
Follow the steps below to disassemble the wheel hub and
service the wheel bearings. See Figure 38.
OIL SEAL
BEARING
WHEEL HUB
LUG NUT
SPINDLE
WASHER
BEARING
CUP
BEARING
CUP
BEARING
SPINDLE
NUT
COTTER PIN
DUST CAP
Figure 37. Adjustable Channel
Wheel Bearings
Wheel bearings (Figure 38) must be inspected and
lubricated once a year or 12,000 miles to insure safe
operation of your trailer.
If trailer wheel bearings are immersed in water, they must
DANGER
be replaced.
If trailer wheels are under water for a long period of
time, wheel bearings may fail. If this is the case, service
wheel bearings immediately.
The possibility exists of the wheels falling off causing
equipment damage and severe bodily harm even death!
Figure 38. Wheel Hub Components
After removing the dust cap, cotter pin, spindle nut and
spindle washer, remove the hub to inspect the bearings
for wear and damage.
Replace bearings that have flat spots on rollers, broken
roller cages, rust or pitting. Always replace bearings
and cups in sets. The inner and outer bearings are to
be replaced at the same time.
Replace seals that have nicks, tears or wear.
Lubricate the bearings with a high quality EP-2
automotive wheel bearing grease.
PAGE 36 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
Page 37
MAINTENANCE
SHACKLE SUPPORT
IS WELDED
TO FRAME
U-BOLT
LOCKING
NUT
SHACKLE
BOLT
TIE
PLATE
SHACKLE
NUT
HANGER SUPPORT
IS WELDED
TO FRAME
HANGER
SUPPORT
BOLT
AXLE
HANGER
SUPPORT
NUT
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WHEEL HUB ADJUSTMENT
Every time the wheel hub is removed and the bearings are
reassembled, follow the steps below to check the wheel
bearings for free running and adjust.
Turn the hub slowly, by hand, while tightening the spindle
nut until you can no longer turn the hub by hand.
Loosen the spindle nut just until you are able to turn it
(the spindle nut) by hand. Do not turn the hub while the
spindle nut is loose.
Install a new cotter pin through the spindle nut and axle.
Check the adjustments. Both the hub and the spindle nut
should be able to move freely (the spindle nut motion
will be limited by the cotter pin).
DANGER
NEVER crawl under the trailer unless it is on firm
and level ground and resting on properly placed and
secured jackstands.
WARNING
If the trailer is involved in an accident, have it inspected
immediately by qualified personnel. In addition, the
trailer should be inspected annually for signs of wear
or deformations.
LEAF SUSPENSION
The leaf suspension springs and associated components
(Figure 39) should be visually inspected every 6,000 miles
for signs of excessive wear, elongation of bolt holes, and
loosening of fasteners. Replace all damaged parts
(suspension) immediately.
The possibility exists of the trailer falling thus causing
equipment damage and severe bodily harm even death!
DANGER
When performing trailer inspection and maintenance
activities, you must jack up the trailer using jacks and
jackstands.
When jacking and using jackstands, place them so
as to clear wiring, brake lines, and suspension parts
(i.e., springs, torsion bars). Place jacks and jackstands
inside of the perimeter strip on the supporting structure
to which the axles are attached.
DANGER
Improper weld repair will lead to early failure of the
trailer structure and can cause serious injury or death.
DO NOT repair cracked or broken welds unless you
have a certified welder perform the repair. If not, have
the welds repaired by your dealer.
Figure 39. Leaf Suspension Components
DANGER
Worn or broken suspension parts can cause loss of
control, damage to equipment and severe bodily injury,
even death!
Check suspension regularly.
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 37
Page 38
TRAILER SAFETY GUIDELINES
The following guidelines are intended to assist the operator
Shift your automatic transmission into a lower gear for
use lower gears for climbing and descending
ride the brakes while descending grades, they
may get so hot that they stop working. Then you will
To conserve fuel, don’t use full throttle to climb a hill.
Slow down for bumps in the road. Take your foot off the
brake while in a curve unless absolutely
necessary. Instead, slow down before you enter the
curve and power through the curve. This way, the towing
apply the brakes to correct extreme trailer
swaying. Continued pulling of the trailer, and even slight
Anticipate the trailer “swaying.” Swaying is the trailer
reaction to the air pressure wave caused by passing
trucks and buses. Continued pulling of the trailer provides
a stabilizing force to correct swaying. DO NOT apply the
Use lower gear when driving down steep or long grades.
Use the engine and transmission as a brake. Do not
ride the brakes, as they can overheat and become
Be aware of your trailer height, especially when
Make regular stops, about once each hour. Confi rm
There is appropriate slack in the breakaway switch
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in the operation and handling of a trailer.
Safety precautions should be followed at all times when
operating a trailer. Failure to read, understand and follow
the safety guidelines could result in injury to yourself and
others. Loss of control of the trailer or tow vehicle can result
in death or serious injury.
COMMON CAUSES FOR LOSS OF TRAILER
Driving too fast for the conditions (maximum speed when
towing a trailer is 55 mph).
Overloading the trailer or loading the trailer unevenly.
Trailer improperly coupled to the hitch.
No braking on trailer.
Not maintaining proper tire pressure.
Not keeping lug nuts tight.
Not properly maintaining the trailer structure.
Ensure machine is towed level to tow vehicle.
city driving.
ALWAYS
grades.
DO NOT
potentially have a runaway tow vehicle and trailer.
Instead, build speed on the approach.
brake when crossing the bump.
DO NOT
vehicle remains in charge.
DO NOT
acceleration, will provide a stabilizing force.
TRAILER TOWING GUIDELINES
Recheck the load tiedowns to make sure the load will
not shift during towing.
Before towing, check coupling, safety chain, safety
brake, tires, wheels and lights.
Check the lug nuts or bolts for tightness.
Check coupler tightness after towing 50 miles.
Use your mirrors to verify that you have room to change
lanes or pull into traffi c.
Use your turn signals well in advance. Allow plenty of
stopping space for your trailer and tow vehicle.
Allow plenty of stopping space for your trailer and tow
vehicle.
DO NOT drive so fast that the trailer begins to sway
due to speed.
Allow plenty of room for passing. A rule of thumb is that
the passing distance with a trailer is 4 times the passing
distance without the trailer.
brakes to correct trailer swaying.
ineffective.
approaching roofed areas and around trees.
that:
• Coupler is secure to the hitch and is locked.
• Electrical connectors are secure.
• There is appropriate slack in the safety chains.
•
pullpin cable.
• Tires are not visibly low on pressure.
PAGE 38 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
Page 39
TRAILER SAFETY GUIDELINES
DRIVING CONDITIONS
When towing a trailer, you will have decreased acceleration,
increased stopping distance, and increased turning radius
(which means you must make wider turns to keep from
hitting curbs, vehicles, and anything else that is on the
inside corner). In addition, you will need a longer distance
to pass, due to slower acceleration and increased length.
COUPLING TO THE TOW VEHICLE
Follow all of the safety precautions and instructions in
this manual to ensure safety of persons, equipment, and
satisfactory life of the trailer. Always use an adequate tow
vehicle and hitch. If the vehicle or hitch is not properly
selected and matched to the Gross Vehicle Weight Rating
(GVWR) of your trailer, you can cause an accident that
could lead to death or serious injury.
If you already have a tow vehicle, know your vehicle tow
rating and make certain the trailer’s rated capacity is less
than or equal to the tow vehicle’s rated towing capacity. If
you already have (or plan to buy) a trailer, make certain
that the tow rating of the tow vehicle is equal to or greater
than that of the trailer.
The trailer VIN tag contains the critical safetyinformation
for the use of your trailer. Again, be sure your hitch and tow
vehicle are rated for the Gross Vehicle Weight Rating of
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your trailer.
WARNING
Be alert for slippery conditions. You are more likely to be
affected by slippery road surfaces when driving a tow
vehicle with a trailer, than driving a tow vehicle without
a trailer.
Check rearview mirrors frequently to observe the trailer
and traffi c.
NEVER drive faster than what is safe.
WARNING
Driving too fast for severe road conditions can result in
loss of control and cause death or serious injury.
Decrease your speed as road, weather, and lighting
conditions deteriorate.
Always check for local trailer tow speed limits in your
area.
WARNING
Do not transport people on the trailer. The transport of
people puts their lives at risk and may be illegal.
Proper selection and condition of the coupler and hitch
are essential to safely towing your trailer. A loss of
coupling may result in death or serious injury.
• Be sure the hitch load rating is equal to or greater
than the load rating of the coupler.
• Be sure the hitch size matches the coupler size.
• Observe the hitch for wear, corrosion and cracks
before coupling. Replace worn, corroded or cracked
hitch components before coupling the trailer to the
tow vehicle.
• Be sure the hitch components are tight before
coupling the trailer to the tow vehicle.
WARNING
An improperly coupled trailer can result in death or
serious injury.
DO NOT move the trailer until:
• The coupler is secured and locked to hitch.
• The safety chains are secured to the tow vehicle.
• The trailer jack(s) are fully retracted.
DO NOT tow the trailer on the road until:
• Tires and wheels are checked.
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 39
• The trailer brakes are checked.
• The breakaway switch is connected to the tow
vehicle.
• The load is secured to the trailer.
• The trailer lights are connected and checked.
WARNING
Use of a hitch with a load rating less than the load rating
of the trailer can result in loss of control and may lead
to death or serious injury.
Use of a tow vehicle with a towing capacity less than
the load rating of the trailer can result in loss of control,
and may lead to death or serious injury.
Be sure your hitch and tow vehicle are rated for the
Gross Vehicle Weight Rating of your trailer.
Page 40
TRAILER SAFETY GUIDELINES
INOPERABLE BRAKES, LIGHTS OR MIRRORS
Be sure that the brakes and all of the lights on your trailer
are functioning properly before towing your trailer. Check
the trailer taillights by turning on your tow vehicle headlights.
Check the trailer brake lights by having someone step on
the tow vehicle brake pedal while you look at trailer lights.
Do the same thing to check the turn signal lights. See Trailer
Wiring Diagram section in this manual.
Standard mirrors usually do not provide adequate visibility
for viewing traffi c to the sides and rear of a towed trailer.
You must provide mirrors that allow you to safely observe
approaching traffi c.
TRAILER TOWING TIPS
Driving a vehicle with a trailer in tow is vastly different
from driving the same vehicle without a trailer in tow.
Acceleration, maneuverability and braking are all diminished
with a trailer in tow.
It takes longer to get up to speed, you need more room to
turn and pass, and more distance to stop when towing a
trailer. You will need to spend time adjusting to the different
feel and maneuverability of the tow vehicle with a loaded
trailer.
Because of the signifi cant differences in all aspects of
maneuverability when towing a trailer, the hazards and risks
of injury are also much greater than when driving without
a trailer. You are responsible for keeping your vehicle and
trailer in control, and for all the damage that is caused if
you lose control of your vehicle and trailer.
As you did when learning to drive an automobile, fi nd
an open area with little or no traffi c for your fi rst practice
trailering. Of course, before you start towing the trailer, you
must follow all of the instructions for inspection, testing,
loading and coupling. Also, before you start towing, adjust
the mirrors so you can see the trailer as well as the area
to the rear of it.
Drive slowly at fi rst, 5 mph or so, and turn the wheel to
get the feel of how the tow vehicle and trailer combination
responds. Next, make some right and left hand turns.
Watch in your side mirrors to see how the trailer follows
the tow vehicle. Turning with a trailer attached requires
Stop the rig a few times from speeds no greater than
10 mph. If your trailer is equipped with brakes, try using
different combinations of trailer brake and tow vehicle brake.
Note the effect that the trailer brakes have when they are
the only brakes used. When properly adjusted, the trailer
It will take practice to learn how to back up a tow vehicle
with a trailer attached. Take it slow. Before backing up, get
out of the tow vehicle and look behind the trailer to make
Some drivers place their hands at the bottom of the steering
wheel, and while the tow vehicle is in reverse, “think” of the
hands as being on the top of the wheel. When the hands
move to the right (counterclockwise, as you would do to
turn the tow vehicle to the left when moving forward), the
rear of the trailer moves to the right. Conversely, rotating
the steering wheel clockwise with your hands at the bottom
of the wheel will move the rear of the trailer to the left while
If you are towing a bumper hitch rig, be careful not to allow
the trailer to turn too much because it will hit the rear of the
tow vehicle. To straighten the rig, either pull forward or turn
Figure A below is a sample of the Vehicle Identifi cation
Number (VIN) Tag which is typically located on the left front
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WARNING
Improper electrical connection between the tow vehicle
and the trailer will result in inoperable lights and can
lead to collision.
Before each tow, check that the tail lights, brake lights
and turn signals work.
more room.
brakes will come on just before the tow vehicle brakes.
sure that there are no obstacles.
backing up.
the steering wheel in the opposite direction.
TRAILER VIN TAG
of the trailer. See Figure B for location.
PAGE 40 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
Figure A. Vehicle VIN Tag
Page 41
The trailer VIN Tag contains the following critical safety
information for the use of your trailer.
GAWR
It is the lowest of axle, wheel, or tire rating.
Usually, the tire or wheel rating is lower than the axle rating,
and determines GAWR.
GVWR
and its contents. The gross weight of the trailer includes
the weight of the trailer and all of the items within it. GVWR
is sometimes referred to as GTWR (Gross Trailer Weight
Rating), or MGTW (Maximum Gross Trailer Weight). GVWR,
GTWR and MGTW are all the same rating.
The sum total of the GAWR for all trailer axles may be less
than the GVWR for the trailer, because some of the trailer
load is to be carried by the tow vehicle, rather than by the
trailer axle(s). The total weight of the cargo and trailer must
not exceed the GVWR, and the load on an axle must not
exceed its GAWR.
PSIC
VIN
EMPTY WEIGHT
trailer (such as the Manufacturer’s Statement of Origin)
is not a reliable source for “empty” or “net” weight. The
shipping documents list average or standard weights and
your trailer may be equipped with options.
VIN
TAG
To determine the “empty” or “net” weight of your trailer,
weigh it on an axle scale. To fi nd the weight of the trailer
using an axle scale, you must know the axle weights of
your tow vehicle without the trailer coupled. Some of the
trailer weight will be transferred from the trailer to the tow
vehicle axles, and an axle scale weighs all axles, including
The towing hitch attached to your tow vehicle must have a
capacity equal to or greater than the load rating of the trailer
you intend to tow. The hitch capacity must also be matched
to the tow vehicle capacity. Your vehicle dealer can provide
Sway bars, shock absorbers, heavy duty springs, heavy
duty tires and other suspension components may be
For trailers equipped with electric brakes, the electric brake
controller is part of the tow vehicle and is essential in the
operation of the electric brakes on the trailer. The brake
controller is not the same as the safety breakaway brake
The size of the trailer that is being towed and your state
law regulations determine the size of the mirrors. However,
some states prohibit extended mirrors on a tow vehicle,
except while a trailer is actually being towed. In this
situation, detachable extended mirrors are necessary.
Check with your dealer or the appropriate state agency
A Heavy Duty Flasher is an electrical component that may
be required when your trailer turn signal lights are attached
An Electrical Connector connects the light and brake
systems on the trailer to the light and brake controls on
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VIN TAG
TRAILER SAFETY GUIDELINES
the tow vehicle axles.
TOW VEHICLE
Figure B. Typical VIN Tag Location
: The maximum gross weight that an axle cansupport.
: The maximum allowable gross weight of the trailer
: The tire pressure (psi) measured when cold.
: The Vehicle Identifi cation Number.
: Some information that comes with the
and install the proper hitch on your tow vehicle.
SUSPENSION SYSTEM
required to suffi ciently tow the trailer and pump.
BRAKE CONTROLLER
system that may be equipped on the trailer.
SIDE VIEW MIRRORS
for mirror requirements.
HEAVY DUTY FLASHER
to the tow vehicle fl asher circuit.
ELECTRICAL CONNECTOR
the towing vehicle.
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 41
Page 42
TRAILER SAFETY GUIDELINES
EMERGENCY FLARES AND TRIANGLE REFLECTORS
It is wise to carry these warning devices even if you are
not towing a trailer. It is particularly important to have these
when towing a trailer because the hazard fl ashers of your
towing vehicle will not operate for as long a period of time
when the battery is running both the trailer lights and tow
vehicle lights.
SAFETY CHAINS
If the coupler connection comes loose, the safety chains
can keep the trailer attached to the tow vehicle. With
properly rigged safety chains, it is possible to keep the
tongue of the trailer from digging into the road pavement,
even if the coupler-to-hitch connection comes apart.
TRAILER LIGHTING AND BRAKING CONNECTOR
A device that connects electrical power from the tow vehicle
to the trailer. Electricity is used to turn on brake lights,
running lights, and turn signals as required. In addition, if
your trailer has a separate braking system, the electrical
connector will also supply power to the brakes from the
tow vehicle.
BREAKAWAY SYSTEM
If the trailer coupler connection comes loose, the breakaway
system can actuate emergency hydraulic brakes depending
on the type of actuator on the trailer. The breakaway cable
must be rigged to the tow vehicle with appropriate slack
that will activate the system if the coupler connection
comes loose.
JACKSTAND
A device on the trailer that is used to raise and lower the
coupler. The jack is sometimes called the “landing gear” or
the “tongue jack”.
COUPLER TYPES
Five types of couplers are available.
BALL HITCH COUPLER
A ball hitch coupler (Figure C) connects to a ball that is
located on or under the rear bumper of tow vehicle. This
system of coupling a trailer to a tow vehicle is sometimes
A ball hitch trailer may be fi tted with a tongue jack that can
raise and lower the coupler. The tongue jack is mounted to
the A-frame (front or tongue) part of the trailer. By rotating
the jack handle clockwise, the jack will extend and raise
Before each tow, coat the ball with a thin layer of automotive
bearing grease to reduce wear and ensure proper operation.
Check the locking device that secures the coupler to the
If you see or feel evidence of wear, such as fl at spots,
deformations, pitting or corrosion, on the ball or coupler,
immediately have your dealer inspect them to determine
the proper action to prevent possible failure of the ball and
coupler system. All bent or broken coupler parts must be
The coupler handle lever must be able to rotate freely and
automatically snap into the latched position. Oil the pivot
points, sliding surfaces, and spring ends with SAE 30W
motor oil. Keep the ball socket and latch mechanism clean.
Dirt or contamination can prevent proper operation of the
The load rating of the coupler and the necessary ball size
are listed on the trailer tongue. You must provide a hitch and
ball for your tow vehicle where the load rating of the hitch
Also, the ball size must be the same as the coupler size. If
the hitch ball is too small, too large, is underrated, is loose
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referred to as “bumper pull.”
the tongue of the trailer.
Figure C. Ball Hitch Coupler
ball for proper operation.
replaced before towing the trailer.
Ball Hitch Coupler, 2 5/16" Standard (EE43253)
Pintel Eye Coupler, 3" Option (29369)
Ball Hitch Coupler, 2" Option (29228)
Ball Hitch Bulldog, 2" Option (EE57033)
Ball Hitch Bulldog, 2 5/16" Option (EE56638)
PAGE 42 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
latching mechanism.
and ball is equal to or greater than that of your trailer.
Page 43
TRAILER SAFETY GUIDELINES
or is worn, the trailer can come loose from the tow vehicle
and may cause death or serious injury.
THE TOW VEHICLE, HITCH AND BALL MUST HAVE A
RATED TOWING CAPACITY EQUAL TO OR GREATER
THAN THE TRAILER
(GVWR)
OF THE SAME SIZE AS THE COUPLER.
The ball size and load rating (capacity) are marked on the
ball. Hitch capacity is marked on the hitch.
the trailer tongue. Wood or concrete blocks may also
Lubricate the hitch ball and the inside of the coupler with
Slowly back up the tow vehicle so that the hitch ball is
Using the jackstand at the front of trailer (tongue), turn
the jackstand crank handle to raise the trailer. If the ball
coupler does not line up with the hitch ball, adjust the
Open the coupler locking mechanism. Ball couplers have
a locking mechanism with an internal moving piece and
an outside handle. In the open position, the coupler is
Lower the trailer (Figure D) until the coupler fully engages
Engage the coupler locking mechanism. In the engaged
position, the locking mechanism securely holds the
Insert a pin or lock through the hole in the locking
Be sure the coupler is all the way on the hitch ball and
the locking mechanism is engaged. A properly engaged
locking mechanism will allow the coupler to raise the rear
of the tow vehicle. Using the trailer jackstand, verify that
you can raise the rear of the tow vehicle by 1 inch after
Lower the trailer so that its entire tongue weight is held
Raise the jackstand to a height where it will not interfere
2-INCH
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be used.
Coupling the Trailer to the Tow Vehicle (Ball Coupler)
. IT IS ESSENTIAL THAT THE HITCH BALL BE
WARNING
Coupler-to-hitch mismatch can result in uncoupling,
leading to death or serious injury.
Be sure the LOAD RATING of the hitch ball is equal or
greater than the load rating of the coupler.
Be sure the SIZE of the hitch ball matches the size of
the ball coupler.
WARNING
A worn, cracked or corroded hitch ball can fail while
towing and may result in death or serious injury.
Before coupling trailer, inspect the hitch ball for wear,
corrosion and cracks.
Replace worn or damaged hitch ball.
Gross Vehicle Weight Rating
a thin layer of automotive bearing grease.
near or aligned under the coupler.
position of the tow vehicle.
able to drop fully onto the hitch ball.
the hitch ball.
TRAILER
COUPLER
VEHICLE
2-INCH
BALL
TOW
WARNING
A loose hitchball nut can result in uncoupling, leading
to death or serious injury.
Be sure the hitch ball is tight to the hitch before coupling
the trailer.
Rock the ball to make sure it is tightened to the hitch,
and visually check that the hitch ball nut is solid against
the lock washer and hitch frame.
Wipe the inside and outside of the coupler. Clean and
visually inspect it for cracks and deformations. Feel the
inside of the coupler for worn spots and pits.
Be sure the coupler is secured tightly to the tongue of the
trailer. All coupler fasteners must be visibly solid against
the trailer frame.
The bottom surface of the coupler must be above the top
of the hitch ball. Use the tongue jackstand to support
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 43
Figure D. Ball Hitch Coupling Mechanism
coupler to the hitch ball.
mechanism.
the coupler is locked to the hitch.
by the hitch.
with the road.
Page 44
If the coupler cannot be secured to the hitch ball, do not
tow the trailer. Call your dealer for assistance. Lower the
trailer so that its entire tongue weight is held by the hitch and
continue retracting the jack to its fully retracted position.
Attaching Safety Chain
Visually inspect the safety chains and hooks for wear or
damage. Replace worn or damaged safety chains and
hooks before towing.
Attach the safety chains so that they:
.
NOTICE
SAFETY CHAINS
TOW
Breakaway Brake System
If the coupler or hitch fails, a properly connected and
working breakaway brake system (Figure F) will apply the
hydraulic brakes on the trailer. The safety chains will keep
the tow vehicle attached and as the brakes are applied at
the trailer’s axles, the trailer/tow vehicle combination will
The breakaway brake system includes a brake cable
connected to the tow vehicle on one end and to the
emergency brake lever located on the hydraulic actuator
Connect Cable
to
Actuator
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Overloading can damage the tongue jack. DO NOT
use the tongue jack to raise the tow vehicle more than
one inch.
TRAILER SAFETY GUIDELINES
• Cross underneath the coupler. See Figure E.
VEHICLE
TRAILER
TONGUE
IMPORTANT!
SAFETY CHAIN
MASTER LINK
Figure E. Attaching Safety Chain (Ball Hitch)
CROSS BOTH
• Loop around a frame member of the tow vehicle or holes
provided in the hitch system (DO NOT attach them to
an interchangeable part of the hitch assembly).
• Have enough slack to permit tight turns, but not be
close to the road surface, so if the trailer uncouples, the
safety chains can hold the tongue up above the road
WARNING
Improper rigging of the safety chains can result in
loss of control of the trailer and tow vehicle, leading
to death or serious injury, if the trailer uncouples from
the tow vehicle.
• Fasten chains to frame of tow vehicle. DO NOT fasten
chains to any part of the hitch unless the hitch has
holes or loops specifi cally for that purpose.
• Cross chains underneath hitch and coupler with
enough slack to permit turning and to hold tongue
up, if the trailer comes loose.
come to a controlled stop.
TowVehicle
Hydraulic Actuator
Figure F. Breakaway Brake System
Breakaway Lever
Connect Cable
to TowVehicle
Breakaway Switch
Electric
Breakaway Cable Surge Brake System
on the other end.
WARNING
• An ineffective breakaway brake system can result in
a runaway trailer, leading to death or serious injury,
if the coupler or ball hitch fails.
• Connect the breakaway cable to the tow vehicle and
NOT to the hitch, ball or support.
• Before towing the trailer, test the function of the
breakaway brake system. If the breakaway brake
system is not working, DO NOT tow the trailer. Have
it serviced or repaired.
NOTICE
DO NOT tow the trailer with the breakaway brake
system ON because the brakes will overheat which
can result in permanent brake failure.
NOTICE
Replace the breakaway brake battery (if equipped) at
intervals specifi ed by manufacturer.
PAGE 44 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
Page 45
TRAILER SAFETY GUIDELINES
Connecting Trailer Lights
Connect the trailer lights to the tow vehicle’s electrical
system using the electric connectors at the front of the
trailer (tongue). Refer to the wiring diagram shown in the
trailer wiring diagram section of this manual. Before towing
the trailer check for the following:
Uncoupling the Ball Hitch
Follow these steps to uncouple ball hitch from tow
vehicle:
PINTLE HITCH COUPLER
A pintle eye coupler (Figure G) connects to a pintle-hook
hitch that is located on or under the rear bumper of the tow
vehicle. This system of coupling a trailer to a tow vehicle is
sometimes referred to as a “lunette eye, tow ring or G.I.
A pintle hitch trailer may be fi tted with a tongue jackstand
that can raise and lower the coupler. The tongue jack is
mounted to the A-frame (front or tongue) part of the trailer.
By rotating the jack handle clockwise, the jack will extend
The load rating of the coupler and the necessary pintle
hitch size are listed on the trailer tongue. You must provide
a pintle hitch and pintle coupler for your tow vehicle, where
the load rating of the pintle hitch and pintle coupler is equal
Also, the pintle hitch size must be the same as the pintle
coupler size. If the hitch is too small, too large, underrated,
loose or worn, the trailer can come loose from the tow
Before each tow, check the locking device that secures the
The pintle hook lever must be able to operate freely and
automatically snap into place into the latched position.
Lightly oil the pivot points and sliding surfaces with SAE30W
motor oil to prevent rust and help ensure proper operation
If you see or feel evidence of wear, such as fl at spots,
deformations, pitting or corrosion, on the pintle hook or
coupler, immediately have your dealer inspect them to
determine the proper action to prevent possible failure of
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Running lights (turn on tow vehicle headlights).
Brake Lights (step on tow vehicle brake pedal).
Backup Lights (place tow vehicle gear shift in reverse).
Turn Signals (activate tow vehicle directional signal
lever).
WARNING
Improper electrical connection between the tow vehicle
and the trailer will result in inoperable lights and electric
brakes, and can lead to collision.
Before each tow:
• Check that the taillights, brake lights and turn signals
work.
• Check that the electric brakes work by operating the
brake controller inside the tow vehicle.
hitch.”
Figure G. Pintle Hitch Coupler
and raise the tongue of the trailer.
Block trailer tires to prevent the trailer from rolling, before
jacking the trailer up.
Disconnect the electrical connector.
Disconnect the breakaway brake switch cable. Promptly
replace the pullpin in the switchbox.
Before extending jackstand, make certain the ground
surface below the jackstand foot will support the tongue
load.
Rotate the jackstand handle (or crank) clockwise. This
will slowly extend the jack and transfer the weight of the
trailer tongue to the jack.
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 45
to or greater than that of your trailer.
vehicle, and may cause death or serious injury.
Pintle Coupler and Pintle Hook
coupler to the pintle hook assembly.
of the latching mechanism.
Page 46
TRAILER SAFETY GUIDELINES
the ball andcoupler system. All bent or broken coupler parts
must be replaced before towing the trailer.
THE TOW VEHICLE, PINTLE HITCH AND PINTLE
COUPLER MUST HAVE A RATED TOWING CAPACITY
EQUAL TO OR GREATER THAN THE TRAILER
Vehicle Weight Rating (GVWR)
IT IS ESSENTIAL THAT THE PINTLE HITCH BE OF THE
SAME SIZE AS THE PINTLE COUPLER.
The coupler size and load rating (capacity) are marked on
the coupler. Hitch capacity is marked on the hitch.
Slowly back up the tow vehicle so that the pintle
hitch hook is near or aligned under the pintle eye ring
Using the jackstand at the front of trailer (tongue), turn
the jackstand crank handle to raise the trailer. If the pintle
eye coupler does not line up with the pintle hitch hook,
OPEN the pintle hook locking mechanism (Figure H).
Place the hook inside the eye coupler. CLOSE the pintle
Insert a pin or lock through the hole in the locking
Be sure the pintle hook is inserted completely through
the eye ring and the locking mechanism is engaged.
A properly engaged locking mechanism will allow the
coupler to raise the rear of the tow vehicle. Using the
trailer jack, test to see that you can raise the rear of the
tow vehicle by1-inch after the coupler is locked to the
Lower the trailer so that its entire tongue weight is held
Raise the jackstand to a height where it will not interfere
TRAILER
SAFETY CHAINS
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WARNING
A defective pintle hitch not properly fastened can result
in uncoupling, leading to death or serious injury.
.
WARNING
Coupler-to-hitch mismatch can result in uncoupling,
leading to death or serious injury.
Be sure the LOAD RATING of the pintle hitch hook is
equal or greater than the load rating of the pintle eye
coupler.
Be sure the SIZE of the pintle hitch hook matches the
size of the pintle eye coupler.
WARNING
A worn, cracked or corroded pintle hitch hook can fail
while towing, and may result in death or serious injury.
Before coupling trailer, inspect the pintle hitch hook for
wear, corrosion and cracks.
Replace worn or damaged pintle hitch hook.
Gross
Be sure the pintle hook is securly tighten to the tow
vehicle before coupling the trailer.
Coupling Trailer to Tow Vehicle (Pintle Coupler)
coupler.
adjust the position of the tow vehicle.
hook mechanism.
PINTLE
TOW
VEHICLE
SAFETY
CHAIN
HOOK
RING “EYE”
IMPORTANT!
CROSS BOTH
PINTLE
TONGUE
SAFETY CHAIN
MASTER LINK
Rock the pintle eye coupler to make sure it is secured
tightly to the hitch.
Wipe the inside and outside of the pintle coupler. Clean
and inspect it visually for cracks and deformations. Feel
Figure H. Attaching Safety Chain (Pintle Hitch)
mechanism.
the inside of the coupler for worn spots and pits.
Be sure the coupler is secured tightly to the tongue of the
trailer. All coupler fasteners must be visibly solid against
the trailer frame.
Raise the bottom surface of the coupler to be above the
top of the pintle hitch hook. Use the tongue jackstand
to support the trailer tongue. Wood or concrete blocks
may also be used.
hitch.
by the hitch.
with the road.
PAGE 46 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
Page 47
TIRE SAFETY
Unsafe Tires, Lug Nuts or Wheels
Trailer tires and wheels are more likely to fail than car tires
and wheels because they carry a heavier load. Therefore,
it is essential to inspect the trailer tires before each tow.
If a tire has a bald spot, bulge, cuts, is showing any cords,
or is cracked, replace the tire before towing. If a tire has
uneven tread wear, take the trailer to a dealer service
center for diagnosis.
Uneven tread wear can be caused by tire imbalance, axle
misalignment or incorrect infl ation.
Tires with too little tread will not provide adequate tracking
on wet roadways and can result in loss of control, leading
to death or serious injury.
Improper tire pressure causes an unstable trailer and
can result in a tire blowout and loss of control. Therefore,
before each tow you must also check the tire pressure. Tire
pressure must be checked when tires are cold.
Allow 3 hours cool-down after driving as much as 1 mile at
40 mph before checking tire pressure. Trailer tires will be
infl ated to higher pressures than passenger vehicle tires.
Since trailer wheels and lug nuts (or bolts) are subjected
to greater side loads than automobile wheels, they are
more prone to loosen. Before each tow, check to make
sure they are tight.
The proper tightness (torque) for lug nuts is listed in the
lug nut tightening section of this manual. Use a torque
wrench to tighten the lug nuts. If you do not have a torque
wrench, use a lug wrench (from your tow vehicle) and
tighten the nuts as much as you can. Then have a service
garage or trailer dealer tighten the lug nuts to the proper
torque.
Lug nuts are also prone to loosen after first being
assembled. When driving a new trailer (or after wheels
have been remounted), check to make sure they are tight
after the fi rst 10, 25 and 50 miles of driving and before
Failure to perform this check can result in a wheel parting
from the trailer and a crash, leading to death or serious
Determining the load limits of a trailer includes more than
understanding the load limits of the tires alone. On all
trailers there is a Federal certifi cation/VIN label that is
located on the forward half of the left (road) side of the unit.
This certifi cation/VIN label will indicate the trailer’s Gross
Vehicle Weight Rating (GVWR). This is the most weight
the fully loaded trailer can weigh. It will also provide the
Gross Axle Weight Rating (GAWR). This is the most a the
wheel(s) have been remounted after the fi rst 10, 25
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TRAILER SAFETY GUIDELINES
each tow thereafter.
injury.
WARNING
Lug nuts are prone to loosen after initial installation,
which can lead to death or serious injury.
Check lug nuts for tightness on a new trailer or when
and 50 miles of driving.
WARNING
Metal creep between the wheel rim and lug nuts will
cause rim to loosen and could result in a wheel coming
off, leading to death or serious injury.
Tighten lug nuts before each tow.
WARNING
Improper lug nut torque can cause a wheel parting from
the trailer, leading to death or serious injury.
Be sure lug nuts are tight before each tow.
WARNING
Improper tire pressure can result in a blowout and loss
of control, which can lead to death or serious injury.
Be sure tires are infl ated to pressure indicated on side
wall before towing trailer.
Determining Load Limit of Trailer
axle can weigh.
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 47
Page 48
TRAILER SAFETY GUIDELINES
There is a vehicle placard (Figure I) located in the same
location as the certifi cation label described above. This
placard provides tire and loading information. In addition,
this placard will show a statement regarding maximum
cargo capacity.
If additional work items (hoses, tools, clamps etc.) are
going to be added to the trailer, be sure they are distributed
evenly to prevent overloading front to back and side to side.
Heavy items should be placed low and as close to the axle
positions as reasonable. Too many items on one side may
overload a tire.
Excessive loads and/or underinfl ation cause tire overloading
and, as a result, abnormal tire fl exing occurs. This situation
can generate an excessive amount of heat within the tire.
Excessive heat may lead to tire failure. It is the air pressure
that enables a tire to support the load, so proper infl ation
is critical. The proper air pressure may be found on the
certifi cation/VIN label and/or on the Tire and Loading
Information placard. This value should never exceed the
maximum cold infl ation pressure stamped on the tire.
Perform the following steps to determine the load limit of
your trailer.
Step 1.
Locate the statement, “The weight of cargo should never
exceed XXX kg or XXX lbs.,” on your vehicle’s Tire and
Loading Information placard (Figure I). This value equals
the available amount of equipment load capacity.
Step 2.
Determine the weight of the equipment being loaded
on the tow vehicle. That weight may not safely exceed
the available equipment load capacity. The trailer’s Tire
Information Placard is attached adjacent to or near the
trailer’s VIN (Certifi cation) label at the left front of the trailer
(See Figure I).
Determining Load Limit of Tow Vehicle
Locate the statement, “The combined weight of occupants
and cargo should never exceed XXX lbs.,” on your vehicle’s
Determine the combined weight of the driver and
Subtract the combined weight of the driver and passengers
The resulting fi gure equals the available amount of cargo
and luggage capacity. For example, if the “XXX” amount
equals 1400 lbs. and there will be fi ve 150 lb. passengers
in your vehicle, the amount of available cargo and luggage
Determine the combined weight of luggage and cargo
being loaded on the vehicle. That weight may not safely
exceed the available cargo and luggage capacity calculated
If your vehicle will be towing a trailer, load from your trailer
will be transferred to your vehicle. Consult the tow vehicle’s
manual to determine how this weight transfer reduces the
Studies of tire safety show that maintaining proper tire
pressure, observing tire and vehicle load limits (not carrying
more weight in your vehicle than your tires or vehicle can
safely handle), avoiding road hazards and inspecting tires
for cuts, slashes and other irregularities are the most
important things you can do to avoid tire failure, such as
tread separation or blowout and fl at tires. These actions,
along with other care and maintenance activities, can
Help protect you and others from avoidable breakdowns
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Step 1.
The weight of cargo should never exceed XXX kg. Or XXX lbs.
TIRE
FRONT
REAR
SPARE
TIRE AND LOADING INFORMATION
SIZE
COLD TIRE PRESSURE
Figure I. Trailer Tire Placard
SEE OWNER’S
MANUAL FOR
ADDITIONAL
INFORMATION
PAGE 48 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
placard.
Step 2.
passengers who will be riding in your vehicle.
Step 3.
from XXX kilograms or XXX pounds.
Step 4.
capacity is 650 lbs. (1400-750 (5 x 150) = 650 lbs.).
Step 5.
in Step 4.
available cargo and luggage capacity of your vehicle.
also:
Improve vehicle handling.
and accidents.
Improve fuel economy.
Increase the tire life.
Page 49
TRAILER SAFETY GUIDELINES
Use the information contained in this section to make tire
safety a regular part of your vehicle maintenance routine.
Recognize that the time you spend is minimal compared
with the inconvenience and safety consequences of a fl at
tire or other tire failure.
TIRE FUNDAMENTALS
Federal law requires tire manufacturers to place standardized
information on the sidewall of all tires (Figure J). This
information identifies and describes the fundamental
characteristics of the tire and also provides a tire
identifi cation number for safety standard certifi cation and
in case of a recall.
P
Next number
millimeters of the tire from sidewall edge to sidewall edge.
In general, the larger the number, the wider the tire.
Next number
ratio, gives the tire’s ratio of height to width. Numbers of
70 or lower indicate a short sidewall for improved steering
response and better overall handling on dry pavement.
P
has been the industry standard for the past 20 years.
Next number
diameter in inches. If you change your wheel size, you
will have to purchase new tires to match the new wheel
diameter.
Next number
load index. It is a measurement of how much weight each
tire can support. You may fi nd this information in your
owner’s manual. If not, contact a local tire dealer.
You may not fi nd this information on all tires because it is
not required by law.
M+S: The “M+S” or “M/S” indicates that the tire has
some mud and snow capability. Most radial tires have
these markings; hence, they have some mud and snow
: The speed rating denotes the speed at
which a tire is designed to be driven for extended periods
of time. The ratings range from 99 miles per hour (mph) to
186 mph. These ratings are listed in Table A. Note: You may
not fi nd this information on all tires because it is not required
: This begins with the
letters “DOT” and indicates that the tire meets all federal
standards. The next two numbers or letters are the plant
code where it was manufactured, and the last four numbers
represent the week and year the tire was built. For example,
the numbers 3197 means the 31st week of 1997. The other
numbers are marketing codes used at the manufacturer’s
discretion. This information is used to contact consumers
: The number of
plies indicates the number of layers of rubber-coated fabric
in the tire. In general, the greater the number of plies, the
more weight a tire can support. Tire manufacturers also
must indicate the materials in the tire, which include steel,
: This number indicates the
maximum load in kilograms and pounds that can be carried
: This number
is the greatest amount of air pressure that should ever be
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capability.
Figure J. Standard Tire Sidewall Information
: The “P” indicates the tire is for passenger vehicles.
Speed Rating
by law.
Table A. Speed Rating
Letter Rating Speed Rating
Q 99 mph
R 106 mph
S 112 mph
T 118 mph
U 124 mph
H 130 mph
V 149 mph
W 168* mph
Y 186* mph
U.S. DOT Tire Identifi cation Number
: This three-digit number gives the width in
: The “R” stands for radial. Radial ply construction of tires
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 49
: This two-digit number, known as the aspect
: This two-digit number is the wheel or rim
: This two- or three-digit number is the tire’s
Note:
if a tire defect requires a recall.
Tire Ply Composition and Materials Used
nylon, polyester, and others.
Maximum Load Rating
by the tire.
Maximum Permissible Infl ation Pressure
put in the tire under normal driving conditions.
Page 50
TRAILER SAFETY GUIDELINES
Uniform Tire Quality Grading Standards (UTQGS)
Treadwear Number
rate. The higher the treadwear number is, the longer it
should take for the tread to wear down. For example, a tire
graded 400 should last twice as long as a tire graded 200.
Traction Letter:
on wet pavement. A higher graded tire should allow you
to stop your car on wet roads in a shorter distance than a
tire with a lower grade. Traction is graded from highest to
lowest as “AA”,”A”, “B”, and “C”.
Temperature Letter:
resistance to heat. The temperature grade is for a tire that
is infl ated properly and not overloaded. Excessive speed,
underinfl ation or excessive loading, either separately or
in combination, can cause heat build-up and possible tire
failure. From highest to lowest, a tire’s resistance to heat
is graded as “A”, “B”, or “C”.
Refer to Figure K for additional tire information for light
trucks.
Tires for light trucks have other markings besides those
found on the sidewalls of passenger tires.
LT
ST
Max. Load Dual
indicates the maximum load and tire pressure when the tire
is used as a dual, that is, when four tires are put on each
rear axle (a total of six or more tires on the vehicle).
Max. Load Single
information indicates the maximum load and tire pressure
when the tire is used as a single.
Load Range: This information identifi es the tire’s load-
Slow down if you have to go over a pothole or other
run over curbs or other foreign objects in the
Check tire infl ation pressure weekly during use to insure
Inspect tires for uneven wear patterns on the tread,
cracks, foreign objects, or other signs of wear or
Remove bits of glass and foreign objects wedged in
check tire pressure on tow vehicle and trailer
before towing. Check tire pressure at least once a
overload tow vehicle. Check the tire information
and loading placard for safe allowable tire loading
The proper repair of a punctured tire requires a plug for the
hole and a patch for the area inside the tire that surrounds
the puncture hole. Punctures through the tread can be
repaired if they are not too large, but punctures to the
sidewall should not be repaired. Tires must be removed
from the rim to be properly inspected before being plugged
Replace the tire before towing the trailer if the tire treads
have less than 1/16 inch depth or the telltale bands are
visible. Check infl ation pressure weekly during use to insure
the maximum tire life and tread wear. A bubble, cut or bulge
in a side wall can result in a tire blowout. Inspect both side
walls of each tire for any bubble, cut or bulge; and replace
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: This number indicates the tire’s wear
This letter indicates a tire’s ability to stop
This letter indicates a tire’s
carrying capabilities and its infl ation limits.
Tire Safety Tips
object in the road.
DO NOT
roadway, and try not to strike the curb when parking.
the maximum tire life and tread wear.
DO NOT bleed air from tires when they are hot.
trauma.
the tread.
Make sure your tire valves have valve caps.
ALWAYS
month.
DO NOT
conditions.
Tire Repair
Figure K. UTQGS Tire Information
: The “LT” indicates the tire is for light trucks or trailers.
: An “ST” is an indication the tire is for trailer use only.
PAGE 50 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
kg (lbs) at kPa (psi) Cold: This information
kg (lbs) at kPa (psi) Cold: This
and patched.
Replacing Worn or Damaged Tires
a damaged tire before towing the trailer.
Page 51
TRAILER SAFETY GUIDELINES
Table B below will help pinpoint the causes and solutions
of tire wear problems.
Wheel Rims
If the trailer has been struck, or impacted, on or near the
wheels, or if the trailer has struck a curb, inspect the rims for
damage (i.e. being out of round); and replace any damaged
wheel. Inspect the wheels for damage every year, even if
no obvious impact has occurred.
Wheels, Bearings and Lug Nuts
A loose, worn or damaged wheel bearing is the most
common cause of brakes that grab.
To check wheel bearings, jack trailer and check wheels
for side-to-side looseness. If the wheels are loose, or spin
with a wobble, the bearings must be serviced or replaced.
Check infl ation pressure weekly during use to insure the
maximum tire life and tread wear. Most trailer axles are
built with sealed bearings that are not serviceable. Sealed
bearings must be replaced as complete units.
It is extremely important to apply and maintain proper wheel
mounting torque on the trailer. Be sure to use only the
fasteners matched to the cone angle of the wheel. Proper
Torque all lug nuts in sequence. See Figure L. DO
NOT torque the wheel lug nuts all the way down.
Tighten each lug nut in 3 separate passes as defi ned
Check to see if the lug nuts are tight after the fi rst 10,
25 and 50 miles of driving and before each tow
Wheel Lug Nuts Tightening Sequence
Discount-Equipment.com
NOTICE
Table B. Tire Wear Troubleshooting
Wear Pattern Cause Solution
Center Wear Over infl ation.
Adjust pressure to particular
load per tire manufacturer.
Edge Wear Under infl ation.
Side Wear
Toe Wear Incorrect toe-in. Align wheels.
Cupping Out-of-balance.
Flat Spots
Loss of camber
or overloading.
Wheel lockup and
tire skidding.
Adjust pressure to particular
load per tire manufacturer.
Make sure load does not
exceed axle rating.
Align wheels.
Check bearing adjustment
and balance tires.
Avoid sudden stops when
possible and adjust brakes.
WARNING
ALWAYS wear safety glasses when
removing or installing force fi tted parts. DO
NOT attempt to repair or modify a wheel.
DO NOT install an inner-tube to correct a
leak through through the rim. If the rim is
cracked, the air pressure in the inner tube may cause
pieces of the rim to explode (break off) with great force
and cause serious eye or bodily injury.
NEVER use an pneumatic air gun to tighten wheel
lug nuts.
Over-tightening lug nuts will result in breaking the studs
or permanently deforming the mounting stud holes in
the wheels.
WARNING
Lug nuts are prone to loosen after initial installation,
which can lead to death or serious injury. Check all
wheel lug nuts periodically.
Lug Nut Torque Requirements
procedure for attachment of the wheels is as follows:
1. Start all wheel lug nuts by hand.
2.
by Table C.
3.
thereafter
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 51
Figure L.
Page 52
Lights and Signals
Before each tow, check the trailer taillights, stoplights, turn
signals and any clearance lights for proper operation.
Table C. Tire Torque Requirements
Replace any broken or burned-out lamps as necessary.
Check the wire harness for cuts, fraying or other damage.
Figure M. Trailer to Tow Vehicle Wiring Diagram
Discount-Equipment.com
Wheel Size
12" 20-25 35-40 50-65
13" 20-25 35-40 50-65
14" 20-25 50-60 90-120
15" 20-25 50-60 90-120
16" 20-25 50-60 90-120
First Pass
FT-LBS
Second Pass
FT-LBS
Third Pass
FT-LBS
TRAILER SAFETY GUIDELINES
If it needs replacing, contact your dealer.
WARNING
Improper operating taillights, stoplights and turn signals
can cause collisions.
Check all lights before each tow.
NOTICE
The WT5HP comes standard with a flat 4-pin molded
connector, and the WTE5HP comes with a 7-pin
connector. Reference wiring diagram below.
PAGE 52 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
Page 53
TROUBLESHOOTING
Discount-Equipment.com
Pump Troubleshooting
Symptom Possible Problem Solution
Not enough priming water in the housing? Add water.
Engine speed too low? Increase throttle.
Strainer plugged? Clean strainer.
Suction hose damaged? Replace or repair hose, and clamps.
Pump does not take
on water.
Pump takes in water, little or
no discharge.
Suction hose leaks at inlet.
Discharge does not stay on
coupling.
Air leak at suction port?
Pump is located too high above water line? Move pump closer to water.
Debris collecting in pump housing? Clean pump housing.
Too much distance between impeller
and volute.
Water leaking out weep hole between pump
and engine?
Engine speed too low? Increase throttle speed.
Suction strainer partially plugged? Clean strainer.
Impeller/Volute worn?
Fittings/clamps are not sealed properly?
Hose diameter is too large?
Pressure too high? Check pressure, add additional clamp.
Hose kinked or end blocked? Check hose.
Check that fittings are tight and properly
sealed.
Adjust clearance by adding shims or
replace impeller. Min. .006" - Max. .020".
Check condition of mechanical seal and
gaskets, between pump end and engine
housing.
Adjust clearance by adding shims or
replace impeller/volute.
Tighten, replace or add clamp. (Keep
extra seals on pump).
Use smaller diameter hose or replace
hose.
Impeller jammed or blocked?
Impeller does not turn:
pump is hard to start.
WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17) — PAGE 53
Impeller and volute binding?
Defective engine? See Engine Owner's Manual.
Open pump cover and clean dirt and
debris from inside housing.
Adjust clearance by removing shim from
behind impeller.
Page 54
Symptom Possible Problem Solution
Discount-Equipment.com
Diffi cult to start, fuel is available, but no spark at
spark plug.
Diffi cult to start, fuel is available, and spark is
present at the spark plug.
Diffi cult to start, fuel is available, spark is
present and compression is normal.
Diffi cult to start, fuel is available, spark is
present and compression is low.
No fuel present at carburetor.
TROUBLESHOOTING
Troubleshooting (Engine)
Spark plug bridging? Check gap, insulation or replace spark plug.
Carbon deposit on spark plug? Clean or replace spark plug.
Short circuit due to defi cient spark plug
insulation?
Improper spark plug gap? Set to proper gap.
Spark plug is red? Check transistor ignition unit.
Spark plug is bluish white?
No spark present at tip of spark plug?
No oil? Add oil as required.
Oil pressure alarm lamp blinks upon starting? (if
applicable)
ON/OFF switch is shorted? Check switch wiring, replace switch.
Ignition coil defective? Replace ignition coil.
Improper spark gap, points dirty? Set correct spark gap and clean points.
Condenser insulation worn or short circuiting? Replace condenser.
Spark plug wire broken or short circuiting? Replace defective spark plug wiring.
Wrong fuel type?
Water or dust in fuel system? Flush fuel system.
Air cleaner dirty? Clean or replace air cleaner.
Choke open? Close choke.
Suction/exhaust valve stuck or protruded? Reseat valves.
Piston ring and/or cylinder worn? Replace piston rings and/or piston.
Cylinder head and/or spark plug not tightened
properly?
Head gasket and/or spark plug gasket damaged? Replace head and spark plug gaskets.
No fuel in fuel tank? Fill with correct type of fuel.
Fuel cock does not open properly?
Fuel fi lter/lines clogged? Replace fuel fi lter.
Fuel tank cap breather hole clogged? Clean or replace fuel tank cap.
Air in fuel line? Bleed fuel line.
Check spark plug insulation, replace if worn.
If insuffi cient compression, repair or replace
engine. If injected air leaking, correct leak. If
carburetor jets clogged, clean carburetor.
Check transistor ignition unit is broken, and
replace defective unit. Check if voltage cord
cracked or broken and replace. Check if spark
plug if fouled and replace.
Check automatic shutdown circuit, "oil sensor".
(if applicable)
Flush fuel system, replace with correct type of
fuel.
Torque cylinder head bolts and spark plug.
Apply lubricant to loosen fuel cock lever,
replace if necessary.
PAGE 54 — WT5HP/WTE5HP/WT5HPSG WATER TRAILERS • OPERATION MANUAL — REV. #1 (03/14/17)
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