Giant P300 Series, P321, P324, P318, P314 Operating Instructions/ Repair And Service Manual
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P300 Series -
Operating Instructions/
Repair and Service Manual
12 & 20 mm versions
For Models: P314, P318, P321, P324, P327, and P330
Triplex Ceramic
Plunger Pump
Updated 11/17
Contents:
Installation Instructions: page 2
Pump Specications: page 3
Exploded View: page 4
Parts List/Kits: page 5
Kits/Torque Specications: page 6
Pump Mounting Selection Guide: page 6
Recommended Spare Parts List: page 6
Trouble Shooting: page 7
Repair Instructions: pages 8-10
Dimensions: page 11
Warranty Info: back page
INSTALLATION INSTRUCTIONS
Installation of the Giant Industries, Inc., pump is
not a complicated procedure, but there are some
basic steps common to all pumps. The following information is to be considered as a general
outline for installation. If you have unique requirements, please contact Giant Industries, Inc.
or your local distributor for assistance.
1. The pump should be installed at on a base to
a maximum of a 15 degree angle of inclination to
ensure optimum lubrication.
2. The inlet to the pump should be sized for the ow
rate of the pump with no unnecessary restrictions
that can cause cavitation. Teon tape should be
used to seal all joints. If pumps are to be operated
at temperatures in excess of 160
insure a positive head to the pump to prevent cavitation.
*Make sure that suction pulsation is sufciently
dampened - water column release must be avoided.
3. The discharge plumbing from the pump should be
properly sized to the ow rate to prevent line pres-
sure loss to the work area. It is essential to provide a
safety bypass valve between the pump and the work
area to protect the pump from pressure spikes in the
event of a blockage or the use of a shut-off gun.
4. Use of a dampener is necessary to minimize
pulsation at drive elements, plumbing, connections,
and other system areas. The use of a dampener with
0
F, it is important to
Giant Industries, Inc. pumps is optional, although
recommended by Giant Industries, Inc. to further reduce system pulsation. Dampeners can also reduce
the severity of pressure spikes that occur in systems
using a shut-off gun. A dampener must be positioned
downstream from the unloader.
5. When viewed from the side of the pump, crankshaft rotation is clockwise on pumps with left handed
shafts and counterclockwise on pumps with right
handed shafts. Reverse rotation may be safely
achieved by removing the valve casing from the
crankcase and rotate the pumps 180 degrees to the
desired position. Be certain to rotate the seal case
(item #20) as well, so that the weep holes are down
at the six o’clock position. Exchange the oil ll and
the oil drain plugs, also. Refer to the repair instructions as necessary for the proper assembly sequence. Required horsepower for system operation
can be obtained from the date located on page 3.
6. Before beginning operation of your pumping
system, remember: Check that the crankcase and
seal areas have been properly lubricated per recommended schedules. Do not run the pump dry for
extended periods of time. Cavitation will result in
severe damage. Always remember to check that all
plumbing valves are open and that pumped media
can ow freely to the inlet of the pump.
Important! If there is a danger of frost, the water
in the pump and in the pump ttings (particularly the
unloader valve) must be emptied. The second discharge port can also be used and the pump run “dry”
for 1-2 minutes for this purpose.
Finally, remember that high pressure operation in a pump system has many advantages. But, if it is used
carelessly and without regard to its potential hazard, it can cause serious injury.
IMPORTANT OPERATING CONDITIONS
1. Prior to initial operation, add oil to the crankcase so that oil level is between the two lines on the oil dipstick. DO NOT OVERFILL.
hours or less depending on operating conditions.
2. Pump operation must not exceed rated pressure, volume, or RPM. A pressure relief device must be installed in the discharge of the system.
3. Acids, alkalines, or abrasive uids cannot be pumped unless approval in writing is obtained before operation from Giant Industries, Inc.
4. Run the pump dry approximately 10 seconds to drain the water before exposure to freezing temperatures.
Failure to comply with any of these conditions invalidates the warranty.
Use Giant oil - P/N 01153 (20W-50 non-detergent motor oil)
Crankcase oil should be changed after the rst 50 hours of operation, then at regular intervals of 500
Consult the factory for special requirements that must be met if the pump
is to operate beyond one or more of the limits specied on the next page.
2
U.S. Measurements
Pump Specications
Max.
Flow
Model GPM PSI RPM BHP °F in in
P327 2.9 3500/4000 3450 7.0/8.0 160 0.47 0.42
P314 3.8 3500/4000 3450 9.2/10.5 160 0.47 0.56
P321 3.8 3200/3500 3450 8.4/9.2 160 0.47 0.56
P318 4.8 2000 1450 6.6 160 0.79 0.56
P324 4.8 2200 1450 7.3 160 0.79 0.56
P318 5.8 1000 1750 4.0 160 0.79 0.56
P324 5.8 1100 1750 4.4 160 0.79 0.56
P330 6.5 1000 3450 4.5 160 0.79 0.31
Metric Measurements
Max.
Flow
Model L/min Bar RPM kW °C mm mm
P327 11.0 240/275 3450 5.2/6.0 70 12 10.6
P314 14.4 240/275 3450 6.9/7.8 70 12 14.1
P321 14.4 220/240 3450 6.3/6.9 70 12 14.1
P318 18.2 140 1450 4.9 70 20 14.1
P324 18.2 150 1450 5.4 70 20 14.1
P318 22.0 70 1750 3.0 70 20 14.1
P324 22.0 75 1750 3.3 70 20 14.1
P330 24.7 70 3450 3.3 70 20 8.0
Nominal/
Intermittent
Pressure
Nominal/
Intermittent
Pressure
Max.
Speed
Max.
Speed
Power
Req’d
Power
Req’d
Max.
Temp.
Max.
Temp.
Plunger
Diameter
Plunger
Diameter
Stroke
Stroke
Horsepower Ratings:
We recommend a 1.15 service factor be specied when selecting an electric motor as the power source.
To compute electric motor horsepower required, use the following formula: HP = (GPM X PSI) / 1450.
The formula to determine the horsepower required for a gas engine is: HP = (GPM X PSI) / 1150.
The formula to determine the horsepower required for a diesel engine is: HP = (GPM X PSI) / 1250.
For the Application of a Hydraulic Motor:
To Determine the Torque of a Hydraulic Motor -- (GPM x PSI x 36.77) / RPM = Torque (in-lbs)
Calculating RPM / GPM of Pump:
A pump must be connected to an electric motor or gas or diesel engine with the correct ratio of pulleys
and belts to attain the required speed and GPM. The use of a Variable Frequency Drive (VFD) may also
be used to control the RPM of a properly sized electric motor when variable ows are required.
(Max. Pump RPM / Rated Pump GPM) x Required Pump GPM = Required Pump RPM
To calculate a pulley diameter one (1) pulley diameter and the required pump RPM must be known:
(Pump RPM x Pump Pulley Diameter) / Motor RPM = Motor Pulley Diameter
(Motor RPM x Motor Pulley Diameter) / Pump RPM = Pump Pulley Diameter
Common Specications:
Inlet Pressure ......................145 PSI (10 Bar)*
Crankshaft Diameter............0.94” (24mm)
Oil Capacity (short) ..............14.2 . oz. (0.42 L)
Oil Capacity (extended) .......17.0 . oz. (0.5 L)
Inlet Ports ............................(2) 1/2” BSP
Materials Used for P300 Pumps:
Manifold .......... Forged Brass
Plungers .........Solid Ceramic Oxide
Valves ............. High Grade Stainless Steel
Seals............... Nitrile with Fabric Reinforcing
Gear End ........ Aluminum Die-Cast
Discharge Ports ...................(2) 3/8” BSP
Weight .................................16 lbs (7.3 kg)
Shaft Rotation ..........Top of Pulley Towards Fluid End
*
see note page 2
3
Exploded View - P300 Series - 12 and 20 mm
4
P300 - 12 and 20 mm SERIES PARTS LIST
A = P321 B = P314 C = P318 D = P324 E = P327 F = P330
ITEM PART# DESCRIPTION QTY.
1 08326 Crankcase 1
2 06773 Dipstick Assembly 1
3 08410B Crankcase Cover, Short 1
3 08410-LG Crankcase Cover, Extended 1
3A 07190 Oil Drain Plug 1
3B 13262A Gasket for Plug 1
4 08328 O-Ring 1
5 06273 Oil Drain Plug 1
5A 08192 Gasket 1
6 07188 Screw, Short Cover 4
6A 01176-2 Spring Washer 12
6B 01196 Screw, Long Cover 4
7 08303 Bearing Cover I 2
8 08491 Sight Glass 1
9 07193 O-Ring 1
10 07225 Screw with Lock Washer 8
11 08331 Radial Shaft Seal 1
12 01086 Ball Bearing (A,C,F) 2
12 01086A Ball Bearing (B,D,E) 1
12A 07760 Roller Bearing (B,D,E) 1
13 08332 Crankshaft (A,B,C,D) 1
13 08478 Crankshaft (E) 1
13 06508 Crankshaft (F) 1
14 06207 Straight Key 1
15 08333 Connecting Rod 3
16 08413 Plunger Assembly,
12mm (A,B,E) 3
16 08452 Plunger Assembly,
20mm (C,D,F) 3
16A 08367 Plunger Base (C,D,F) 3
16B 08449 Plunger Pipe (C,D,F) 3
16C 08450 Tension Screw (C,D,F) 3
16D 08451 Copper Washer (C,D,F) 3
ITEM PART NO. DESCRIPTION QTY.
17 06542 Wrist Pin 3
17A 22723 Clip Ring 6
18 07770 O-Ring (C,D,F) 3
19 08356 Oil Seal 3
20 08414 Seal Case (A,B,E) 3
20 08357 Seal Case (C,D,F) 3
21 07234 O-Ring (A,B,E) 3
21 07780 O-Ring (C,D,F) 3
22 12027 O-Ring 3
23 07391 Grooved Seal Ring (A,B,E) 3
23 08358 Grooved Seal (C,D,F) 6
23A 08598 Grooved Seal (A,B,E) 3
24 07392 Pressure Ring (A,B,E) 3
24 08346 Pressure Ring (C,D,F) 3
25 08417 Weep Return Ring (A,B,E) 3
25 08361 Weep Return Ring (C,D,F) 3
26 06556 Valve Casing (A,B,E) 1
26 06413 Valve Casing (C,D,F) 1
27 07849 Valve Seat 6
28 07491 Valve Plate 6
29 07906 Valve Spring 6
30 07907 Valve Spring Retainer 6
31 07853 O-Ring 6
32 06546 Valve Plug (A,B,E) 6
32 06350 Valve Plug (C,D,F) 6
32X 07946A Valve Assembly, Complete 6
33 07913 O-Ring 6
34 08363 Hex Head Cap Screw 6
36 13338 Plug, 3/8” BSP 1
36A 08486 Copper Crush Washer, 3/8” 1
37 07109 Plug, 1/2” BSP 1
37A 07661 Seal 1
P300 - 12 and 20 mm SERIES REPAIR KITS
Plunger Packing Kits
P314/P321/P327 - # 09152
Item Part # Description Qty.
21 07234 O-Ring 3
22 12027 O-Ring 3
23 07391 Grooved Seal Ring 3
23A 08598 Grooved Seal 3
24 07392 Pressure Ring 3
P318/P324/P330 - # 09145
Item Part # Description Qty.
21 07780 O-Ring 3
22 12027 O-Ring 3
23 08358 Grooved Seal 6
24 08346 Pressure Ring 3
Valve Assembly Kit - # 09116
Item Part # Description Qty.
31 07853 O-Ring 6
32X 07946A Valve Assembly 6
33 07913 O-Ring 6
Oil Seal Kit - # 09144
Item Part # Description Qty.
19 08356 Oil Seal 3
5
Torque Specications
Preventative Maintenance Check List & Recommended Spare Parts List
Check Daily Weekl y 50 hrs
Every
500 hrs
Every
1500 hrs
Every
3000 hrs
Oil Level/Qual ity X
Oil Leaks X
Water Leaks X
Belts, Pulley X
Plumbing X
Recommended Spare Parts
Oil Change p/n 01153 X X
Plunger Seal Kit (1 kit/pum p) X
Oil Seal Kit (1 kit/pump) X
Valv e Repair Kit (1 kit/pump) X
Position Item# Description Torque Amount
3A 07190 Oil Drain Plug w/ Gasket 22 ft.-lbs. (30 Nm)
5 06273 OIl Drain Plug 22 ft.-lbs. (30 Nm)
6/6B 07188/1196 Screw 88 in.-lbs (10 Nm)
10 07225 Screw with Lock Washer 88 in.-lbs. (10 Nm)
16C 08450 Tension Screw, Plunger 199 in.-lbs. (22.5 Nm)
32 06350/06546 Plug 55 ft.-lbs. (75 Nm)
34 08363 Hex Head Cap Screw, Valve Casing 222 in.-lbs.(25 Nm)
Pump Mounting Selection Guide
Rails
Bushings
01074 - 24 mm Tapered H Bushing
Pulley & Sheaves
01061 - 7.75” Cast Iron 1 gr. - AB Section
01062 - 7.75” Cast Iron - 2 gr. - AB Section
01160 Plated Steel Channel Rails
(L=5.75”X W=1.0” x H+1.812”)
01161 Plated Steel Channel Rails
(L+5.75”x W+1.00”x H=2.50”)
01163 Retro-Fit Rail
(L=12” x W=1.5” x H=3”)
6
TROUBLESHOOTING GUIDE
MALFUNCTION CAUSE REMEDY
The Pressure and/ Worn packing seals Replace packing seals
or the Delivery Broken valve spring Replace spring
Drops Belt slippage Tighten or Replace belt
Worn or Damaged nozzle Replace nozzle
Fouled discharge valve Clean valve assembly
Fouled inlet strainer Clean strainer
Worn or Damaged hose Repair/Replace hose
Worn or Plugged relief valve on pump Clean, Reset, and Replace worn parts
Cavitation Check suction lines on inlet of
pump for restrictions
Unloader Check for proper operation
Water in crankcase High humidity Reduce oil change interval
Worn seals Replace seals
Noisy Operation Worn bearings Replace bearings, Rell crankcase
oil with recommended lubricant
Cavitation Check inlet lines for restrictions
and/or proper sizing
Rough/Pulsating Worn packing Replace packing
Operation with Inlet restriction Check system for stoppage, air
Pressure Drop leaks, correctly sized inlet
plumbing to pump
Accumulator pressure Recharge/Replace accumulator
Unloader Check for proper operation
Cavitation Check inlet lines for restrictions
and/or proper size
Pressure Drop at Gun Restricted discharge plumbing Re-size discharge plumbing to
ow rate of pump
Excessive Worn plungers Replace plungers
Leakage Worn packing/seals Adjust or Replace packing seals
Excessive vacuum Reduce suction vacuum
Cracked plungers Replace plungers
Inlet pressure too high Reduce inlet pressure
High Crankcase Wrong Grade of oil Giant oil is recommended
Temperature Improper amount of oil in crankcase Adjust oil level to proper amount
7
REPAIR INSTRUCTIONS - P300 SERIES - 12 and 20 MM VERSIONS
NOTE: Always take time to lubricate all metal and nonmetal parts with a light lm of oil before reas-
sembly. This step will ensure proper t, at the same time protecting the pump nonmetal parts (i.e., the
elastomers) from cutting and scoring.
1. With a 24mm socket wrench,
remove the (3) discharge
valve plugs and (3) inlet
valve plugs (#32). Inspect
the o-ring (#33) for wear and
replace if damaged.
4. Remove each o-ring (#31).
Inspect all parts for wear and
replace as necessary. Reas-
semble valve assy’s (#32X) &
place in valve casing (#26).
2. Using a needle nose pliers, remove the inlet and
discharge valve assemblies
(#32X).
5. Apply one drop of Loctite
243 to valve plugs (#32) and
tighten to 55 ft.-lbs. (75 Nm).
3. The valve assemblies can
be separated by inserting a
small screw driver between
the valve seat (#27) and its
valve spring retainer (#30).
6. Next, use a 6mm allen
wrench to remove the 6 hex
head cap screws (#34).
NOTE: If there are deposits of
any kind (i.e., lime deposits) in
the valve casing, be certain the
weep holes in the weep return
ring (#25) and valve casing
(#26) have not been plugged.
7. Carefully slide the valve
casing (#26) out over the
plungers with a screwdriver
placed between the valve
casing and crankcase.
8. Remove weep return rings
(#25) from the plungers
(#16). Remove the seal
case (#20) from either
crankcases (#1) or manifold
(#26) by using a screwdriver as shown above.
8
REPAIR INSTRUCTIONS - P300 SERIES - 12 and 20 MM VERSIONS
9. Remove the pressure rings
(#24) and grooved seals
(#23) from the valve casing
(#26). Inspect parts for
wear and replace if necessary.
12. For P314, P321 & P327
pumps, use a at screw
driver to pry the oil seals
(#19) loose from the seal
case (#20).
For P318/P324/P330
Pumps
Note: Occasionally, the
above procedure can be
carried out for P318/P324/
P330 pumps. However, for
P318/P324/P330 pumps
which have the oil seals
that remain in the crank-
case, use a 6mm allen
wrench to rst loosen and
remove the tension screw
(#16C) from the plunger
pipes (#16B). Use a at
screwdriver to pry the oil
seals loose from the crankcase (#1).
10. Remove the weep grooved
seals (#23A for P314,
P321 & P327 and #23 for
P318, P324 & P330) from
the seal case (#20).
13. Check surfaces of the
plunger bases and plunger
pipes (#16B). A damaged
surface will cause accelerated wear on the seals.
Deposits of any kind must
be carefully removed from
the plunger surface. A
damaged plunger must be
replaced!
9
11. Inspect o-rings (#21 and
22) and replace as necessary.
13A. P318/P324/P330 Only!
Clean the old sealant from
the threads of the tension
screw and the plunger base
(#16A). Replace the cop-
per washer (#16D). Place
plunger pipes over plunger
base and secure with tension
screw to 199 in-lbs. (22.5
Nm).
REPAIR INSTRUCTIONS - P300 SERIES - 12 and 20 MM VERSIONS
Reassembly sequence of the P300 Series pump
14. If the oil seals (#19) were
removed, replace them
with the primary seal lip
(grooved side) towards the
crankcase and the dust
lip (tapered end) towards
the valve casing (#26).
Lubricate the seal before
replacing. For P318, P324
and P330, install the oil
scraper (#18) over the
plunger.
17. Generously lubricate the grooved seals (#23) and assemble these
items into the valve casing. Place the weep return rings (#25)
onto each plunger (#16). Place the pressure rings (#24) over the
plungers. Slide the valve casing over the plungers and seat rmly.
Replace the 6 hex head cap screws (#34) and tighten to 222 in.-
lbs. (25 Nm) in a crossing pattern.
15. Place each seal case (#20)
with o-rings (#21, 22) over
the plungers (#16). Be certain the oil seal is centered
with the seal case and tap
rmly until the seal case
is seated squarely on the
crankcase (#1).
16. With the grooved
side pointed toward
the valve casing,
place the weep
grooved seals (#23A
for P314, P321 and
P327 pumps & #23
for P318,P324, and
P330) over each
plunger and into
each seal case
(#20).
Contact Giant Industries or you local
distributor for maintenance of the gear
end of your pump. Phone: 419/531-4600
10
P300 - 12 and 20 mm SERIES DIMENSIONS - INCHES (mm)
11
GIANT INDUSTRIES LIMITED WARRANTY
Giant Industries, Inc. pumps and accessories are warranted by the manufacturer to be free
from defects in workmanship and material as follows:
1. For portable pressure washers and self-service car wash applications, the
discharge manifolds are guaranteed for the life of the pump. Our other pump
parts, used in portable pressure washers and in car wash applications, are
warranted for ve years from the date of shipment for all pumps used in
NON-SALINE, clean water applications.
2. One (1) year from the date of shipment for all other Giant industrial and
consumer pumps.
3. Six (6) months from the date of shipment for all rebuilt pumps.
4. Ninety (90) days from the date of shipment for all Giant accessories.
This warranty is limited to repair or replacement of pumps and accessories of which the
manufacturer’s evaluation shows were defective at the time of shipment by the manufacturer.
The following items are NOT covered or will void the warranty:
1. Defects caused by negligence or fault of the buyer or third party.
2. Normal wear and tear to standard wear parts.
3. Use of repair parts other than those manufactured or authorized by Giant.
4. Improper use of the product as a component part.
5. Changes or modications made by the customer or third party.
6. The operation of pumps and or accessories exceeding the specications set
forth in the Operations Manuals provided by Giant Industries, Inc.
Liability under this warranty is on all non-wear parts and limited to the replacement or repair
of those products returned freight prepaid to Giant Industries which are deemed to be defective due to workmanship or failure of material. A Returned Goods Authorization (R.G.A.)
number and completed warranty evaluation form is required prior to the return to Giant In-
dustries of all products under warranty consideration. Call (419)-531-4600 or fax (419)-5316836 to obtain an R.G.A. number.
Repair or replacement of defective products as provided is the sole and exclusive remedy
provided hereunder and the MANUFACTURER SHALL NOT BE LIABLE FOR FURTHER
LOSS, DAMAGES, OR EXPENSES, INCLUDING INCIDENTAL AND CONSEQUENTIAL
DAMAGES DIRECTLY OR INDIRECTLY ARISING FROM THE SALE OR USE OF THIS
PRODUCT.
THE LIMITED WARRANTY SET FORTH HEREIN IS IN LIEU OF ALL OTHER WARRANTIES OR REPRESENTATION, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY WARRANTIES OR MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE AND ALL SUCH WARRANTIES ARE HEREBY DISCLAIMED AND EXCLUDED
BY THE MANUFACTURER.
GIANT INDUSTRIES, INC., 900 N. Westwood Ave., Toledo, Ohio 43607
PHONE (419) 531-4600, FAX (419) 531-6836, www.giantpumps.com
Copyright 2017 Giant Industries, Inc.
11/17 P300-12_20mm.indd
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