Allmand TLB6235 User Manual

OPERATOR’S MANUAL

January 2005

TLB SERIES

TLB 6235

ALLMAND BROS. INC

P.O. BOX 888

HOLDREGE, NE 68949

PHONE: [phone]

ALLMAND FAX: [phone]

ALLMAND PARTS FAX: [phone]

TLB SERIESTLB SERIES

TLB SERIES

TLB SERIESTLB SERIES

For Parts and Updates visit Allmand on the Web at www.allmand.com

1

INSPECTION CHECK LIST

FOR PREPARING TLB 6235 FOR DELIVERY OR RENTAL

The TLB 6235 requires service as well as proper operation in order to provide the perfor­mance and safety it has been designed for. Never deliver or put a machine into service with
known defects or missing instructions or decals. Always instruct the customer in the proper
operation and safety procedures as described in the operator’s manual. Always provide the
manual with the equipment for proper and safe operation.

CHECK LIST:

 Visually inspect the equipment to ensure that all instructions and decals are in place and

legible.

 Inspect the hydraulic system to insure all connections are tight and secure.
 Lubricate all grease fittings with recommended grease.
 Inspect all hydraulic hose for proper routing and signs of damage.
 Check the condition of the hydraulic cylinders.
 Inspect the steering system, tie rod ends, spindles and wheel bearings and tighten rod

ends regularly.

 Check the outriggers and make sure they operate properly.
 Tighten lug nuts to 80 ft/lb every 50 hours of operation.
 Inspect the loader and backhoe for damage and test for proper operation.
 Inspect the loader bucket stops for damage. (there should be at least 1/2" clearance be-

tween cylinder rod and bucket pin grease zerk).

 Inspect the electrical wiring for signs of damage.
 Inspect the park brake for proper holding strength.
 Inspect the tires to ensure good condition and proper inflation.
 Make sure the battery is fully charged and terminals are tight and clean. Insure the electro-

lyte is at the correct level.

 Check the service intervals for oil filters, fuel filter, air cleaner, engine oil and hydraulic oil.
 Check the engine oil, hydraulic oil and fuel levels.
 Start engine and check for hydraulic leaks.
 Check to make sure the operator’s manual is with the equipment.
 Inspect the machine physically for damage and repair if necessary.

NOTE: See appropriate section of manual for scheduled maintenance intervals

 After completing the inspection checklist, operate the loader and backhoe through a com-

plete operation cycle, following the operating instructions in the operator’s manual.

WARNING

NEVER ALLOW ANYONE TO OPERATE

THE EQUIPMENT WITHOUT PROPER TRAINING!

ALWAYS READ THE INSTRUCTIONS FIRST!

2

INTRODUCTION

This manual provides the information necessary for the safe operation of the Allmand TLB

6235.

The TLB 6235 standard configuration is powered by a diesel engine connected to hydrostatic
pumps that drive hydraulic motors and cylinders that move the machine. Time should be taken
to understand the controls and movement of this equipment.

Specific operating instructions and specifications are contained in this publication to familiar­ize the operator and maintenance personnel with the correct and safe procedures necessary
to maintain and operate the equipment.

Take time to read this book thoroughly. If you are uncertain about any of the information pre­sented in the manual, contact the factory by phone at 800-562-1373 or by fax at 308-995-5887
or contact your dealer, for clarification before operation.

SAFETY SYMBOLS

The purpose of the SAFETY INFORMATION SYMBOL shown below is to attract your special
attention to safety related information contained in the text.

!

DANGER

!

WARNING

!

CAUTION

FAILURE TO UNDERSTAND AND COMPLY WITH SAFETY RELATED INFORMATIONAL
INSTRUCTIONS MAY RESULT IN INJURY TO OPERATOR OR OTHERS. IF YOU DO
NOT UNDERSTAND ANY PART OF THIS INFORMATION CONTACT YOUR DEALER
FOR CLARIFICATION PRIOR TO OPERATING EQUIPMENT.

NOTE

The word NOTE is used to bring your attention to supplementary information in relation to
various aspects of proper operation and maintenance.

NOTE: Keep this manual accessible during operation to provide convenient reference.

NOTE: Any reference in this manual to LEFT or RIGHT shall be determined by looking for-

ward while sitting in the operator’s seat.

3

4

TABLE OF CONTENTS

INSPECTION CHECK LIST 2

INTRODUCTION 3

SAFETY SYMBOLS 3

TABLE OF CONTENTS 5

SAFETY DECALS 6-7

SAFETY 8-14

DESCRIPTION OF MODEL 15-17

OPERATOR’S STATION 18

SPECIFICATIONS 19-20

ENGINE OPERATION 21-23

OPERATING THE TLB 6235 24-26

HYDROSTAT DUMP VALVE OPERATION 26

MAINTENANCE 27

LUBRICATION 28

STORAGE 29

TROUBLESHOOTING 30-36

ISUZU HYDRAULIC SCHEMATIC 37

WIRING SCHEMATIC FOR OPTIONAL EQUIPMENT 38

WIRING SCHEMATIC FOR ISUZU 3CD1 ENGINE 39

SERVICE INFORMATION 40

FORWARD / REVERSE PEDAL “CREEP” ADJUSTMENT 40

FORWARD-REVERSE PEDAL LINKAGE ASSEMBLY 41

PARK BRAKE ADJUSTMENT 40

PARK BRAKE ASSEMBLY 41

5

SAFETY DECALS

SAFETY WARNING!

ALWAYS REPLACE ANY SAFETY AND Refer to these representations of the
INSTRUCTION DECALS THAT BECOME safety warning decals used on the
DAMAGED, PAINTED OR OTHERWISE TLB 6235 to insure correct ordering if
ILLEGIBLE replacing becomes necessary.

Cover panel - upper left

!

D-158

D-191

Cover panel - lower right

D-189

Frame Upright - right side

D-195

Rear Fender-Left of Seat

D-197

Rear Fender-Right of Seat

D-194

ROPS front right upright

6

D-190

ROPS front left upright

SAFETY DECALS

D-179

Right Frame Upright

D-193

Right Frame Rail ahead

of Exhaust Pipe

D-147

On Directional Pedal

D-034

Right Fender next to

Fuel Fill

D-196

Left Side of Throttle

Control

7

AVOID INJURY FROM ROLLOVER ACCIDENTS!

 ALWAYS WEAR YOUR SEAT BELT WHILE OPERATING

THIS MACHINE.

 DO NOT ATTEMPT TO JUMP CLEAR OF A TIPPING

MACHINE. SERIOUS OR FATAL CRUSHING INJURIES
WILL RESULT. THIS MACHINE MAY TIP OVER FASTER
THAN A PERSON CAN JUMP FREE.

TO AVOID ROLLOVERS:

 Be careful when operating on a slope.
 Avoid sharp turns at high speed.
 Balance loads so weight is evenly distributed and load is stable.
 Carry loads close to the ground to aid visibility andlower center of

gravity.

SAFETY

DO NOT OVERLOAD: Know capacity of machine.

Be careful when operating at the edge of an
excavation, trench, drop-off and loading or
unloading from a trailer.

AVOID INJURY FROM BACK OVER ACCIDENTS!

 BEFORE MOVING MACHINE, BE SURE ALL PERSONS

ARE CLEAR OF AREA.

 ALWAYS BE ALERT FOR BYSTANDERS MOVING INTO

THE WORK AREA. SIGNAL TO WARN BYSTANDERS
BEFORE MOVING MACHINE.

 WHEN USING A SIGNAL PERSON, KEEP PERSON IN

VIEW AT ALL TIMES. BE SURE SIGNAL PERSON IS
CLEAR BEFORE BACKING UP.

TO AVOID BACK OVER ACCIDENTS:
 Always look around before you back up. Be sure that everyone is clear

of machine.

 Use a signal person when backing up if view is obstructed. Always

keep signal person in view.

 Learn the meaning of all flags, signs and markings used on the job and

who has the responsibility for signaling.

 Dust, heavy rain, fog, etc., can reduce visibility. As visibility decreases,

reduce speed and use proper lighting.

8

PREVENT MACHINE RUNAWAY

 Avoid possible injury or death from machine

runaway.

 Do not start engine by shorting across starter

terminals.

 Never start engine while standing on the

ground. Start engine only from operator’s seat
with transmission in neutral and park brake
engaged.

AVOID INJURY FROM ROLLAWAY ACCIDENTS

 To prevent rollaway, always make sure machine

is properly secured before leaving operator’s
seat.

 Death or serious injury may result if you attempt

to mount or stop a moving machine.

 TO AVOID ROLLAWAY:
 Park machine on level ground.
 Engage park brake.
 Lower all equipment to ground.
 Stop the engine.
 Block the wheels if you park on a grade and

position machine to prevent rolling.

USE SEAT BELT PROPERLY

 Use seat belt when operating machine to

reduce the chance of injury from an accident
such as a rollover.

 It is important to use the seat belt on ROPS

equipped machines to minimize the chance of
injury from an accident such as a rollover.

 Keep the seat belt in good condition.
 Carefully examine buckle, webbing and attach-

ing hardware.

 Be sure that attaching hardware is in place.

REPLACE THE SEAT BELT IF IT DOES NOT
OPERATE PROPERLY, IS DAMAGED, WORN
OR DETERIORATED IN ANY WAY.

9

USE HANDHOLDS AND STEPS

 DO NOT mount tractor from the drive pedal side.
 Falling is a major cause of personal injury.
 Always face the machine and use a three-point contact when

mounting or dismounting the machine.

 Never jump either on or off the machine.
 Never mount or dismount a moving machine.
 Be careful of slippery conditions on platforms, steps and hand-

rails when mounting or dismounting the machine.

DRIVE MACHINE SAFELY

AVOID DRIVING ON HILLSIDES OR STEEP SLOPES

 Set backhoe boom lock and swing lock to center the

boom before driving.

 This is a potential rollover hazard and could result in

a serious injury or possibly death.

 If you must drive on steep hillsides, moving the

backhoe to the uphill side of the machine may make
the machine more stable, depending upon working
conditions.

DRIVE CAREFULLY:

 On slopes (avoid if at all possible)
 Where space is limited
 Over rough ground, curbs and tracks
 Near a ditch or excavation ALWAYS!

FOR TRAVELING:

 Carry loader bucket low.
 Never carry passengers.

OPERATE BACKHOE SAFELY

Before digging:

 Check location of electrical cables
 Gas lines
 Water and sewer lines
 Avoid accidental machine movement

10

Before changing seats to operate the backhoe:

 Engage park brake.
 Lower loader bucket to the ground.

After changing positions to the rear backhoe
seat:

 Lower stabilizers to the ground.
 Lift rear tires off the ground so as to remove the

weight from the tires.

Otherwise, from the loader operator seat:

 Raise loader bucket and stabilizers
 Drive machine forward to change position
 Properly secure machine after each move.
 DO NOT dig under stabilizers!
 Stabilizers must be set on firm surfaces. Be alert

to possible machine movement when raising
stabilizers and loader bucket.

 Avoid swinging bucket to the downhill side of the

machine when digging on a slope.

 Dump soil on the uphill side. If not, the machine

has a possibility for rollover.

 Move boom slowly when raising loaded bucket

to full height.

 Clear all persons from area of operation and

machine movement.

HANDLE CHEMICAL PRODUCTS SAFELY

 Direct exposure to hazardous chemicals can

cause serious injury. Potentially hazardous
chemicals used with TLB 535 equipment include
such items as lubricants, coolants, paints and
adhesives.

 A Material Safety Data Sheet (MSDS) provides

specific details on chemical products, physical
and/or health hazards, safety procedures and
emergency response techniques.

 Check the MSDS before you start any job using

a hazardous chemical.

 Follow recommended procedures and only use

recommended and approved equipment.

11

WARN OTHERS OF SERVICE WORK

 Unexpected machine movement can cause serious injury or even

death.

 Before performing any work on the machine, attach a “DO NOT

OPERATE” tag to the steering wheel.

USE SAFETY LIGHTS AND DEVICES

 Install and use all safety lights and devices necessary to assure safe

operation and local compliance.

 Keep all safety items in good condition. Replace any missing or

damaged parts immediately.

THE TLB 6235 SHOULD NOT BE DRIVEN ON PUBLIC ROADS
FOR ANY REASON.

 Trailer to job sites or from one work location to another.
 Slow moving vehicles, such as the TLB 6235, present a hazard that,

if involved in an accident, could result in serious injury or possibly
death.

 A few minutes spent loading and trailering the TLB 6235, may save

some one’s life.

THAT LIFE MIGHT BE YOURS!

PROTECT AGAINST FLYING DEBRIS

 Wear safety glasses or goggles to protect from flying

debris.

WEAR PROTECTIVE CLOTHING

 Wear close fitting clothing and safety equipment appro-

priate to the job.

 Operating equipment safely requires the full attention of

the operator. Do not wear radio or music headphones
while operating machine.

12

PROTECT AGAINST NOISE

 Prolonged exposure to loud noise can cause impair-

ment or loss of hearing.

 Wear a suitable hearing protective device such as

earmuffs or earplugs to protect against objectionable
or uncomfortable loud noises.

AVOID POWER LINES

 Keep away from power lines. Serious injury or death

may result. Never move any part of the machine or
load closer to power lines than 3 m. (10 ft.) plus twice
the line insulator length.

BEWARE OF EXHAUST FUMES

 Prevent asphyxiation. Engine exhaust fumes

can cause sickness or death.

 If you must operate in a building, be sure there is

adequate ventilation. Either use an exhaust
pipe extension to remove the exhaust fumes or
open doors and windows to bring in enough
outside air into the area.

KEEP RIDERS OFF MACHINE

 Only allow the operator on the machine. Keep

riders off.

 Riders on machine are subject to injury such as

being struck by foreign objects and being thrown
off of the machine.

 Riders also obstruct the operator’s view, result-

ing in the machine being operated in an unsafe
manner.

HANDLE FUEL SAFELY - AVOID FIRES

 Handle fuel with care, it is highly flammable. Do

not refuel machine while smoking or when near
open flame or sparks.

 Always stop engine before refueling machine.

Do not fill fuel tank inside any building structure.
Always attempt to refuel in the out of doors.

13

KEEP ROPS INSTALLED PROPERLY

Make certain all parts are reinstalled correctly if the roll­over protective structure (ROPS) has been loosened or
removed for any reason.

TORQUE ALL ½” MOUNTING BOLTS TO 37 lb./ft.

!

CAUTION

This Roll Over Protective Structure (ROPS) has been certified to industry and/or government
standards. Any damage or alteration to ROPS, mounting hardware, or seat belt voids the
certification and will reduce or eliminate protection for the operator in the event of a rollover.
The ROPS, mounting hardware, (proper torque-37 lb./ft) and seat belt should be checked after
the first 100 hours of machine operation and every 500 hours thereafter for any evidence of
damage, wear, or cracks. In the event of damage or alteration, the ROPS must be replaced
prior to further operation of the machine

14

DESCRIPTION OF MODEL

TLB 6235

GENERAL

The Allmand TLB 6235 heavy-duty, compact tractor-loader-backhoe is designed for its
size and maneuverability to excavate materials in areas that larger tractor-loader-backhoes
can not access. The front end loader is generally used for excavating, leveling, and for
back filling trenches and other types of excavations. The backhoe is generally used for
excavation of soil to form a trench or opening, depending upon operator’s needs, in areas
where limited space is a factor.

The base unit consists of a chassis, engine, hydrostatic transmission drive system, tires
and wheels, steering system, front end loader, hydraulic system, backhoe and Roll Over
Protective Structure (ROPS).

CHASSIS WITH TWO SEPARATE HYDRAULIC RESERVOIRS

Provisions have been made in each reservoir for one 100 mesh suction strainers, a 1 1/2"
oil fill opening, 1/2" NPT magnetic drain plug and oil level sight gauge. Each reservoir
accomodates approximately 12 gallons of hydraulic fluid and has room for the oil to ex­pand.

The chassis includes mounting provisions for solid rear axle, as well as the oscillating front
axle.

The chassis also includes mounting provisions for a certified ROPS which is attached with
specified hardware. The ROPS can be removed and replaced without affecting certifica­tion. Refer to page 14 of this manual for instructions on this operation.

HYDROSTATIC TRANSMISSION DRIVE SYSTEM

The machine is driven by an Eaton infinitely variable hydrostatic transmission consisting of
a variable displacement pump and a fixed displacement motor. The pump unit includes a
servo control valve.

Control of the variable displacement piston pump is the key to controlling vehicle speed.
Prime mover horsepower is transmitted by the pump when the operator moves the directional
control pedal. When the variable piston pump swash plate is tilted, a positive stroke to the
piston is created.

15

This in turn, at any given input speed, produces a certain flow from the pump. This flow is
transferred through high pressure lines to the motor. The ratio of the volume of flow from
the pump to the fixed displacement of the motor will determine the speed of the motor
output shaft.

Speed of the output shaft is controlled by adjusting the displacement flow of the transmis­sion. Load ( working pressure) is determined by the external conditions (grade, ground
conditions, etc.) and this establishes the demand on the system.

Pump and motor are contained in separate housings. Oil is drawn directly from the reser­voir into the hydrostatic charge pump. This oil then passes through a 500 psi 5 micron
fiberglass pressure filter. This filter has an internal bypass valve that bypasses fluid to the
reservoir when the filter becomes plugged.

The park brake is integral to the Comer front axle. The brake is activated by an adjustable
hand lever conveniently located to the right of the operators seat.

POWER STEERING SYSTEM

The power steering is fully fluid linked. It consists of a manually operated load sensing
steering control valve and a steering cylinder that is attached to the left and right steering
arms. Fluid pressure is supplied from the load sensing gear pump to the steering control
valve and is directed to the appropriate side of the steering cylinder. The steering control
valve is a non-load reaction design which holds the axle position whenever the operator
releases the steering wheel.

HYDRAULIC SYSTEM

Total system capacity is 25 gallons. Oil leaves the reservoir through two separate suction
lines: one for the hydrostatic drive system and the other supplies the auxiliary hydraulic
pump. The hydrostatic drive system draws fluid from the right reservoir through the 100
mesh suction strainer. The hydraulic transmission offers infinitely variable control of speed
and direction. The operator has complete control of the TLB 6235 with the control foot
pedal for starting and stopping, in forward and reverse motion.

The auxiliary hydraulic circuit draws fluid through a 100 mesh suction strainer. Fluid enters
the accessory pump which is a 8.0 g.p.m. gear type pump.

The circuit delivers fluid to the load-sensing steering control valve . Fluid out of the steering
control valve returns to the reservoir. The remainder of the flow, approximately 8 g.p.m.,
enters the manual control valve which supplies fluid for control of the loader arm cylinders
and loader bucket cylinders. The valve is equipped with a 2500 p.s.i. relief valve. Fluid to
the backhoe is supplied by a power beyond port off the hydraulic control valve for the
loader.

The loader control valve and backhoe control valve, both return through a 5 micron return
filter with a pressure bypass. As in all hydraulic systems, reliability depends upon clean
and cool oil.

16

LOADER

The loader assembly is manufactured to handle most excavation and landscaping projects.
Critical locations on the loader arms and cylinder mounts are reinforced with plate steel to
add durability. The pivot points of the loader are constructed of high strength steel to
create a wear resistant joint.

The bucket assembly is manufactured to provide a structurally stable container to excavate,
transfer, and load most types of product. The cutting edge is reinforced by a 1/2" thick
grader blade material spanning the full width of the bucket. The bucket working capacity is
1/2 cubic yard.

TIRES and WHEELS

The TLB 6235is standard equipped with, 12-16.5 12 Ply tubeless tires for the front and
14-17.5 14 Ply tubeless tires for the rear. Recommended tire pressure for the rear tires is
75 psi max. Inflate front tires to 80 psi maximum.

BACKHOE

Refer to the ALLMAND Backhoe Operators Manual for any general information.

ENGINE - ISUZU DIESEL

Power is provided by a ISUZU 3CD1 32.7 HP., four-cycle, three cylinder, water cooled
diesel engine. (Horsepower rating is made with engine at 3000 RPM) Engine includes:
low oil pressure sensor, high water temperature sensor (these sensors operate warning
lights on the dash panel. Tractor is not equipped with automatic shutdown systems), 12
VDC electrical system with starter, glow plugs, fuel solenoid and 20 amp. regulated alterna­tor charging circuit. Features like full pressure lubrication, Zexel individual injection pumps,
quick and easy access to routine service areas and use of quality, long lasting components
provide a durable and dependable power source.

17

OPERATOR’S STATION

INSTRUMENT PANEL AND CONTROLS-DIESEL ENGINE MODELS

IMPORTANT: When the Low Engine Oil Pressure

indicator is activated, stop engine
immediately and investigate cause of
problem. Do not restart engine until
problem has been corrected.

IMPORTANT: When the High Water Temperature

indicator is activated, do not stop
engine. Reduce load and run engine at
slow idle. If indicator remains on after
several minutes, stop engine and allow
cooling time before servicing engine.

IMPORTANT: When Engine Alternator Low

Volts Indicator is activated, a problem
is developing. It is not necessary to
stop the engine immediately, but the
cause should be investigated as soon
as possible

NOTE: Engine will not start unless foot
pedal is in the neutral position.

A FUEL TANK
B OPERATOR’S MANUAL BOX
C STEERING CONTROL
D KEY SWITCH
E ENGINE THROTTLE
F GLOWPLUG INDICATOR
G FRONT WORKLIGHT SWITCH
H REAR WORKLIGHT SWITCH
I HOUR METER
J WARNING LIGHT CLUSTER GAUGE
K OIL TEMPERATURE GAUGE
L WATER TEMPERATURE GAUGE
M FOOT PEDAL--FORWARD/REVERSE
N LOADER HYDRAULIC CONTROL LEVER
O PARK BRAKE

H

G

F

E

C

D

B

A

I

J

K

N

ML

A

O

18

SPECIFICATIONS

OVERALL DIMENSIONS

 Weight 5800 lbs. (2631 kg)
 Length 18’ 2” (5.5 m)
 Height 93" (2.4 m)
 Width 67" (1.7 m)
 Wheelbase 65" (1.7 m)
 Ground Clearance 11.5" (29.2 cm)

TRACTOR

 Engine ISUZU 3CD1
 Transmission Eaton HD Hydrostatic
 Drive motor Eaton 82
 Power steering Eaton Series 5
 Differential Off Highway Planetary

Limited Slip

 Brakes Hydrostatic
 Parking brake Integral to Front Axle
 Speed range 0 to 7.5 MPH
 Auxiliary hydraulic pump Gear pump
 Auxiliary hydraulic output 8 gpm @ 2400 psi
 Fuel tank 12 gallons (45.4 L)
 Hydraulic oil reservoir 25 gallons (91 L)
 Tire size (Front) 12-16.5 12 Ply
 Tire size (Rear) 14-17.5 14 Ply
 Tire Pressure (Front) 80 psi maximum
 Tire Pressure (Rear) 75 psi maximum

LOADER

 Maximum lift height (Bucket Pivot) 110" (2.8 m)
 Clearance with bucket dumped 90" (2.3 m)
 Reach @ maximum height 20" (50.8 cm)
 Reach @ grade 67.5" (1.7 m)
 Bucket rollback angle 40 degrees
 Bucket dump angle 45 degrees
 Digging depth 5" (12.5 cm)
 Lift capacity 2100 lbs. (955 kg)
 SAE Lift capacity 1500 lbs. (682 kg)
 Breakout force 3400 lbs. (1545 kg)
 Bucket width 70"
 Bucket capacity 1/2 yd (.38 cu. m)

Specifications are subject to change without notice

19

HYDROSTATIC TRANSMISSION: EATON – MODEL 72400

Displacement 3.0 in3/r (49.2 cm3/r)
Flow @ rated speed and pressure 38.9 GPM (146.2 L/min.)
Speed, Input 3000 RPM (Max.)
Operating pressure (Max.) 3000 PSI (207 Bar) - Cont.

5000 PSI (345 Bar) - Inter.

Operating temperature 190 deg.F(87.deg.C)(Max.)

.

ENGINE - ISUZU - DIESEL

Model 3CD1
Type Vertical, water cooled, 4-cycle diesel engine
Bore 3.3" (83 mm)
Stroke 3.54" (91 mm)
Displacement 91.3 cu. in. (1.5L)
Power @ 3000 RPM 32.7 HP*
Maximum torque @ 1800 RPM 66.9 ft-lbs (90.7 Nm)
Compression ratio 19:1
Weight 341lbs (155 kg)
Oil capacity 7.14 qts (6.7 L)
Lubrication Forced lubrication by pump with full flow paper filter
Coolant capacity 2.13 Qts (2.0 L)
Cooling system Pressurized radiator, forced circulation with water pump

*Horsepower ratings are established in accordance with Society of Automotive Engineers -

Small Engine Test Code - J1349 GROSS.

AXIAL PISTON MOTOR

 Motor series 74624
 Motor displacement 3.0cm3/rev.

FUEL REQUIREMENTS

Your ISUZU engine is designed to use either Number 1-D or Number 2-D diesel fuel.
However, for better fuel economy, use Number 2-D diesel fuel whenever possible.
At temperatures less than -7 deg C, (20 deg F), when Number 2-D may pose operating
problems at colder temperatures, use Number 1-D fuel (if available) or use a “winterized”
Number 2-D (a blend of Number 1-D and Number 2-D). Check with the service station
operator to be sure you get the properly blended fuel. For more details on fuel see pages
16 through 19 in your Isuzu instruction manual.

ENGINE OIL REQUIREMENTS

Use a high quality engine oil of API (American Petroleum Institute) service class CC/CD.
Refer to pages 21-22 in your Isuzu instruction Manual for more detailed engine oil require­ments.

HYDRAULIC OIL REQUIREMENTS

Use a high quality multipurpose fluid with an SAE 20W/ISO 68 rating.

NOTE: The TLB 6235 has been factory filled with HYDROCLEAR 9836.

20

ENGINE OPERATION

ENGINE BREAK-IN

OBSERVE ENGINE OPERATION CLOSELY

IMPORTANT: Become thoroughly familiar with the sound and feel of your new machine.
Read and understand the Engine Instruction Manual included with your TLB 6235
Refer to the Engine instruction manual for seasonal fuel and oil viscosity recommendations.

NOTE: Engine is warranted to the original owner by the manufacturer.

OPERATOR RESPONSIBILITIES

 Check engine oil daily.
 Operate engine at normal loads.
 Check indicator lights and gauges (if equipped) frequently during operation.
 Avoid excess engine idling.
 Perform all engine maintenance in the Engine Instruction Manual.

NOTE: The engine owner is responsible for the performance of the required maintenance as

defined by the engine manufacturer in the written instructions found in the Engine Instruction
Manual provided with the engine.

CHECK INDICATORS BEFORE STARTING

Turn key switch clockwise and hold in the “RUN” position. All indicator lights must light.
If any indicator fails to light, the bulb may be burned out. If bulb is not burned out and indicator
fails to light up, see your authorized dealer or call the factory.

NOTE: Start engine only from the operator’s seat, with the foot pedal in the neutral position

and the park brake engaged.

PRE-START CHECKLIST

 CHECK oil level, add if low. Do not overfill.
 CHECK fuel level, add if low.
 CHECK cooling air intake areas and external surfaces of engine. Make sure they are clean

and unobstructed.

 CHECK that the air cleaner components and all shrouds, equipment covers and guards are

in place and securely fastened.
CHECK forward / reverse pedal. Make certain that the pedal is exactly in neutral; if not, the
engine will not start.

WARNING: LETHAL EXHAUST GASES

Engine exhaust gases contain poisonous carbon monoxide. Carbon monoxide is odorless,
colorless and can cause death if inhaled. Avoid inhaling exhaust fumes.

NEVER RUN THE ENGINE IN A CLOSED BUILDING OR CONFINED AREA WITHOUT
HAVING ADEQUATE VENTILATION!

21

ENGINE OPERATION

COLD WEATHER STARTING TIPS

1. Be sure to use the proper oil for the temperature expected.

2. Set speed control at part throttle position.

3. If possible warm the battery for more starting capacity.

4. Use fresh fuel at all times. Do not use diesel left over from summer.

COLD WEATHER WARM-UP

In extremely cold weather conditions, an extended warm-up period will be necessary.
Avoid operation of hydraulic systems until engine is thoroughly warmed up and all ice, snow
and frozen mud has been removed from the machine.

NOTE: When hydraulic oil is cold it moves very slowly. Do not attempt machine operation until

hydraulic oil has warmed and hydraulic systems function at close to normal times. Run engine
at 1/2 speed for 15 to 20 minutes. Cycle all hydraulic systems to distribute warmed oil until all
systems operate freely.

COLD WEATHER STARTING

Your TLB 6235 is equipped with the Isuzu Automatic Glow Plug Timer System that
automatically regulates your glow plug heat time by monitoring
water temperature. (see chart). This assures that you will get the
proper amount of glow time to facilitate cold weather starts while
preventing excessive glow plug heat time that could lead to pre­mature glow plug failure. Use the following procedure to start your
TLB 6235 in cold weather:

1. Place throttle control midway between the “slow” and “fast”
positions.

2. Turn the key switch to the ON position. At this time, the glow plug
indicator on the instrument panel will light for a predetermined time

3. When the glow plug indicator goes out, turn the key switch to the “start” position and start

the engine. Release the key immediately when the engine starts. (If engine fails to start,

repeat steps 2 and 3.)

NOTE: Do not operate starter for more than 10 seconds Allow 30 seconds to pass

betweenstarting attempts. Possible stater damage could result from excessive heat
caused by cranking too long. starting attempts.

4. Warm up the engine at mid throttle without load. Insufficiently warming an engine can shorten
its service life.

NOTE: If the engine develops sufficient speed to disengage the starter but does not keep

running (a false start), the engine rotation must be allowed to come to a complete stop

before attempting to restart the engine. If starter is engaged while the flywheel is rotating,
the starter pinion and flywheel ring gear may clash, resulting in damage to the starter or

flywheel ring gear.
NOTE:If the starter does not turn the engine over, stop cranking immediately. Do not make
further attempts to start the engine until the condition is corrected. See your local ISUZU En­gine Service Dealer for trouble analysis.

22

FOR A WARM ENGINE

Follow the same starting procedure as described for cold weather starting. Use of the glow
plugs may not be necessary on a warm engine, and use of the glow plugs is not recommended
in temperatures above 41° F.

IMPORTANT: Always check all the engine warning lights when starting. If the oil pressure
light remains on, immediately stop the engine and check for the cause

STOPPING THE ENGINE

Before leaving the operator’s station:

1. Park the machine on a level surface and lower loader bucket, backhoe bucket and any
other accessories to the ground.

2. Engage park brake.

3. Place the throttle in the “slow” position. Allow the engine to run at least 15 seconds

before stopping the engine.

4. Turn the key switch to the “off” position.

5. Move hydraulic control levers to release hydraulic pressure from the system.

CAUTION: PREVENT POSSIBLE INJURY FROM UNEXPECTED MACHINE
MOVEMENT. NEVER RELY ON NEUTRAL POSITION OF FOOT PEDAL ALONE TO
KEEP THE MACHINE FROM ROLLING. THE MACHINE CAN UNEXPECTEDLY ROLL
OR MOVE UNDER POWER RESULTING IN SERIOUS INJURY OR DEATH.
ALWAYS ENGAGE PARK BRAKE TO HOLD MACHINE STATIONARY!

ENGINE ANGLE OF OPERATION:

!

!

The ISUZU diesel engine can be operated at angles up to 25 degrees.
Check oil level to assure crankcase oil level is at the full mark.
NOTE: Do not operate this engine continuously at angles exceeding 25 degrees in any
direction. Serious engine damage can occur from insufficient oil supply.

COOLING:

NOTE: If debris builds up on the grass screen or other cooling air intake areas, stop the

engine immediately and clean. Running this engine with blocked or dirty air intake and
cooling areas can cause extensive damage due to overheating.

ENGINE SPEED:

NOTE: Do not tamper with the governor setting to increase the maximum engine speed.

Over speed is hazardous and will void engine warranty. The maximum allowable high
idle speed for this engine is 3000 RPM with no load.

BATTERY:

 The TLB 6235 is shipped with a 12 volt, group 24 battery with a 675 CCA rating.
 Check battery electrolyte level regularly and fill as needed.
 Replace with the same group size and amp rating when replacement is needed.

NOTE: The TLB 6235 electrical system is a 12-volt negative (-) ground.

CAUTION: An explosive gas is produced while batteries are in use or being

charged. Keep flames or sparks away from the battery area. Make sure batteries are charged
in a well- ventilated area. Always wear eye protection when servicing or handling batteries.

23

OPERATING THE TLB 535

DRIVING ON PUBLIC ROADS

Become familiar with local laws and ordinances affecting driving on highways.
Use “slow moving vehicle” emblems to alert motorists.

!

CAUTION: USE OF A SEATBELT IS REQUIRED WHEN THE TLB 6235 IS IN
OPERATION TO MINIMIZE THE CHANCE OF INJURY FROM AN ACCIDENT SUCH AS
ROLL OVER.

OPERATING THE TRACTOR

1. Fasten seat belt

2. Retract backhoe bucket and dipperstick functions.

3. Raise backhoe boom, move it to the center, and engage boom lock.

4. Raise stabilizers

5. Switch position to the front facing seat.

6. Raise the loader bucket off the ground and roll bucket back.

PARKING THE MACHINE

Before leaving the operator’s station, do the following:

1. Park the machine on a level surface.

2. Lower all equipment to the ground.

3. Move the throttle to the “slow” position.

4. Move the forward / reverse pedal to the neutral position.

5. Engage park brake.

6. Operate engine at 1/2 speed without load for at least 15 seconds.

7. Turn the key switch to the “off” position, and remove key.

8. Release all hydraulic pressure from the system by moving all hydraulic controls until
loader bucket and backhoe are resting on the ground or on the stops.

CAUTION: PREVENT POSSIBLE INJURY FROM UNEXPECTED MACHINE
MOVEMENT. NEVER RELY ON NEUTRAL POSITION OF FOOT PEDAL ALONE TO
KEEP THE MACHINE FROM ROLLING. THE MACHINE CAN UNEXPECTEDLY ROLL
OR MOVE UNDER POWER RESULTING IN SERIOUS INJURY OR DEATH. ALWAYS
ENGAGE PARK BRAKE TO HOLD MACHINE STATIONARY! IF PARKING ON A SLOPE,
PUT BLOCKS ON THE DOWNHILL SIDE OF THE WHEELS TO PREVENT MOVEMENT.

FORWARD / REVERSE PEDAL

To change direction of movement on the TLB 6235 use the forward / reverse pedal, located
on the right side of the tractor frame.

NOTE: Reduce speed when changing directions of travel for safety.

1. Lightly depress the forward pedal with the toe of the right foot to travel forward.

2. Lightly depress the rear pedal with the heel of the right foot to travel in reverse.

24

NOTE: By lightly depressing the pedals forward and reverse, torque is developed to be

transferred to the drive wheels by the hydraulic motor and differential set-up.

The further the forward and reverse pedals are depressed, the faster ground speed.

Torque will decrease as ground speed increases.

3. Move the forward / reverse pedal to the neutral position to stop.

NOTE: The pedal returns to a neutral detent position when pressure is released from the

forward and reverse pedals.

LOADER CONTROL VALVE LEVER

The loader control valve returns to the neutral position when re­leased, except when in the float position.

A - Move the control valve lever forward to lower loader arms.
AA - Move the control valve lever forward past the detent. This is the

float position.

B - Move the control valve lever back to raise the loader arms.

C - Move the control valve lever left to roll back the bucket.

D - Move the control valve lever right to dump the bucket.

For faster loader cycle times follow these simple tips:

1. Run engine at fast idle.

2. Move the loader boom and the bucket at the same time.

3. Without using force, move control valve lever fully toward each

function.

!

CAUTION

PREVENT POSSIBLE INJURY FROM

UNEXPECTED MACHINE MOVEMENT,

OPERATE THE LOADER ONLY WHEN

YOU ARE IN THE OPERATOR’S SEAT

FACING FORWARD.

OPERATING TIPS

 Reduce speed when driving over rough terrain, carrying heavy loads, or working in a con-

gested area.

 Whenever possible, avoid obstacles, such as rough terrain, rocks, curbs and ditches.
 In general, by decreasing machine speed the control of the machine increases.
 When the backhoe is not in use, the backhoe boom must be locked in the fully raised posi-

tion. Curl the backhoe bucket up and retract dipperstick.

 When driving the TLB 6235 , carry the loader bucket low for good visibility and machine

stability.

 Walk the job site to uncover any hazards and to plan the job.
 Practicing good housekeeping on the job site will help maximize machine stability, reduce

operator fatigue, and increase productivity.

 Material that is loose and fragmented dumps much easier than material that is hard and

compacted.
 Excavate material in thin layers rather than jamming it into the bucket. This will allow the
material to break up as it enters the bucket. This is especially important when moving sticky,
wet materials

25

 Clean the bucket by hand, if at all possible. If rapping the bucket against the stops is the only

option, then do so using MINIMUM force, to prevent cylinder damage.

 DO NOT try removing stuck material from the bucket by striking it against the ground or

another object.

PREPARING TO OPERATE BACKHOE

1. Position loader bucket flat on the ground. Lower loader arms to raise wheels off the
ground.

2. Engage park brake.

3. Switch seats to position operator facing the backhoe.

4. Lower stabilizers to level unit.

5. Disengage swing lock and backhoe boom lock.

PREPARING TO OPERATE LOADER AFTER OPERATING BACKHOE

1. Retract backhoe bucket and dipperstick functions. Raise backhoe boom.

2. Center boom and engage boom lock.

3. Raise stabilizers.

4. Switch seats to position operator facing the front end loader.

Roll back loader bucket until bottom is parallel with the ground.

HYDROSTAT DUMP VALVE OPERATION

The purpose of the dump valve is to allow the movement of a disabled vehicle or if you have
a vehicle that you just want to push a short distance, without starting the engine. When a
hydrostatic driven vehicle is shut down’ it is virtually impossible to move the vehicle without
opening the hydrostatic closed loop circuit.
If an attempt is made to push the vehicle the
hydraulic motor be- comes a pump,
trying to pump oil to the hydrostatic pump.
This creates a hydraulic lock between the
motor and the pump. To overcome this
condition, a dump valve has been installed
between the high pres- sure relief valves in
the backplate of the pis- ton pump. The
dump valve is a plug that contains a rotating
stem which has a flat spade end that fits
between the two ends of the high pressure
relief valves. When the dump valve is in the
“closed position”, the relief valves are
also in the closed posi- tion
as shown in the top illustration. When the dump valve stem is ro- tated
90 degrees, the flat spade end spreads the relief valves to the “open posi­tion” as shown in the lower illustration. This allows the oil in the hy- dro­static closed loop to “by-pass” around the high pressure relief valves in­side the pump backplate. The by-passing of oil inside the pump
backplate will allow the motor to rotate freely when the vehicle is
moved a short distance. The dump valve is intended only for mov- ing a
vehicle a very short distance and not intended for towing a vehicle behind a truck or tractor.

NOTE: serious damage to the hydrostatic drive will result if vehicle is towed. The
dump valve must be completely closed prior to normal operation of the vehicle.

26

MAINTENANCE

MAINTENANCE INSTRUCTIONS

!

WARNING: Accidental Starts!

Before servicing the engine or equipment, always remove the ignition keys to insure there will not be any accidental start up. Make
sure the equipment is in neutral and park brake set.

MAINTENANCE SCHEDULE

These required maintenance procedures should be performed at the frequency stated in the table. They should also be included as

part of any seasonal tune-up.

NOTE: Every 500 hours of operation, separate the pump from the engine. Clean the splined areas and lightly grease
the male portion of the pump spline. Use either Dow Corning G-N Metal Assembly Paste or #77 Assembly Paste.
When remounting the pump, be certain the mating surfaces are clean and correctly aligned.

HOURLY INTERVALS

NO. CHECKPOINTS 8 50 200 250 500 750 1000

1

Check engine oil level, fill if needed X

2

Change engine oil with seasonal viscosity X XXXX
Cooling system circuit cleaning X

3
4

Check battery electrolyte level XX

5

Replace oil filter cartridge XXX

6

Check fan belt for tightness XXX

7

Check oil cooler fins, clean as necessary XXX

8

Check fuel tank for sediment, clean as necessary XX

9

Check radiator hoses and clamps for leaks XX

10

Starter and alternator check X
Check fuel lines for leaks X

11
12

Check air cleaner element XX

13

Replace air cleaner element X

14

Check electrical wiring for damaged or loose connections XX X

15

Tighten tie rods to 35 ft/lbs. XX XXXX

16

Tighten lug nuts to 80 ft/lbs. XX XXXX

17

Check hydraulic oil level, fill if necessary XX

18

Check all fasteners for tightness XX
Check backhoe bucket teeth, replace if necessary X

19
20

Grease all swivel points (loader and backhoe) X

21

Clean or replace suction strainers XX

22

Grease right foot pedal mount and center bearing mount X

23

Check fuel filter, replace if necessary X

24

Check hydraulic hoses for damage and loose connections XX X X

25

Change hydraulic return filter XX X

26

Change hydraulic fluid XX
Check loader bucket stops for damage X

27

O - Indicates that jobs must be done after the first 5 hours respectively.

* - Perform these maintenance procedures more frequently under extremely dusty and

dirty working conditions.

Hydraulic fluid should be changed every 1000 hours after the first 250 hour change.

NOTE: All daily checks should be done with every engine oil change.
NOTE: Change hydraulic return filter at the first 50 hours then every 200 hours.

27

LUBRICATION

The following diagram will direct maintenance personal to the lubrication points that will need
to be greased on a daily schedule. Use of a multi-purpose grease is recommended.

BACKHOE

(Refer to ALLMAND

BACKHOE Manual)

FORWARD/REVERSE

PEDAL PIVOT

(Access hole in floor

plate)

BUCKET CYLINDER

ENDS

BUCKET/LOADER

PIVOT

FRONT AXLE

PIVOT PIN AND

SPINDLES

LOADER PIVOT AND

CYLINDER ENDS

28

STORAGE

PREPARATIONS FOR STORAGE

1. When preparing the TLB 6235 for storage, first remove seat mount plate and steering

column cover. Wash off all dirt and grease from all the major components and connecting
hoses. Coat the exposed cylinder rods with grease and grease all the grease fittings.

2. IMPORTANT: When washing the TLB 6235, allow engine and hydraulic system to cool

before washing. Cold water on a hot engine or hydrostatic pump can cause costly dam­age. DO NOT direct the stream of water, when washing, directly at the hydraulic system
breather, it is possible to get water into the hydraulic system and contaminate the fluid.

3. Make sure the battery is fully charged, battery terminals are clean and have a corrosion

protectant applied.

4. Change the engine oil and run for 5 minutes to allow the oil to penetrate to all the parts.

5. Fill the fuel tank with fuel and add a fuel stablilizer to prevent the diesel fuel from gumming

up the fuel system during storage.

6. Place the TLB 6235 in a clean, dry place and cover if at all possible.

29

TROUBLESHOOTING

GENERAL

Proper troubleshooting begins with an organized approach to the problem at hand. Begin
with investigation of the most probable cause, following the guidelines below.

Study the problem thoroughly before taking action:

 Did warning signs precede the problem? If so, what were they? What would they indicate?
 Is scheduled maintenance current on all parts and systems involved?
 Has similar trouble occurred before? What action was taken at the time?
 Can the engine be operated without further damage?

!

CAUTION

IF RUNNING INSPECTION MUST BE MADE, GET ASSISTANCE. OPERATOR
SHOULD REMAIN SEATED ON MACHINE THROUGHOUT INSPECTION. SET
PARKING BRAKE. MAKE SURE TRANSMISSION IS IN NEUTRAL POSITION.

Check the most convenient things first:

 Don’t begin major work before checking all other possibilities.
 Reconsider all known facts and clues before proceeding to more in-depth work.

Correct the basic cause:
 Remember, failure of a certain part may be caused by a malfunction of another part or system.

SCHEMATICS:

This troubleshooting section incorporates electrical schematic diagrams formatted for

ease of use by maintenance and for the training of personnel.

!

WARNING

THE TROUBLESHOOTING CHART AND PROCEDURES OUTLINED IN THIS
SECTION SHOULD NOT BE ATTEMPTED BY OTHER THAN EXPERIENCED
MECHANICS OR PERSONNEL UNDER THE DIRECT SUPERVISION OF AN
EXPERIENCED MECHANIC. FAILURE TO COMPLY MAY RESULT IN DAMAGE
TO EQUIPMENT AND/OR INJURY OR DEATH TO PERSONNEL.

30

TROUBLESHOOTING CHART

A

The troubleshooting chart lists problems that might be encountered in the operation of the

TLB 6235. The remedies listed may direct the repairman to a possible faulty component.

A - ENGINE

 For engine troubleshooting charts indicating faults and recommended repair procedures,

refer to Manufacturer’s Operation and Maintenance Manual.

 If your particular problem is not covered or you are unsure of what steps to take, contact

factory for assistance.

C – TRANSMISSION
TLB 6235 fails to move under power:

 Parking brake set
 Inadequate oil level in hydraulic reservoir
 Control pedal or linkage broken or loose
 Inadequate oil flow through transmission suction filter
 Drive coupling mechanical failure
 Hydrostatic pump failure
 Drive motor failure

 Charge loup filter plugged

TLB 6235 moves in neutral:

 Control pedal neutral centering device broken or out of adjustment.
 Neutral centering device return spring broken.

For detailed troubleshooting information on hydrostatic transmission, refer to Trouble Shooting
Manual, Eaton Hydrostatic Transmissions, available from an Eaton representative or dealer.

C – ELECTRICAL SYSTEM

ENGINE
STATUS
Running

Running

Won't Start

Won't Start

Stopped

VOLTMETER READING INDICATES TO CORRECT

13.5 to 14 volts Normal Condition None
Less than 13.5 volts or more
than 14 volts
12 to 12.5 volts Weak Battery Charge Battery

Less than 12 volts
Excessive current draw Short Circuit Inspect System

lternator or Regulator

Malfunction

Weak Battery or
Defective Battery Cell

Contact Dealer

Charge or Replace Battery

D - HYDRAULIC SYSTEM

 Thoroughly review description of hydraulic system, pages 16 and 17 of this text.
 Use logical steps to determine cause of malfunction.
 Identify the function or functions which require troubleshooting.
 If possible, trace malfunction to source: pump, control, motor or cylinder.
 Determine if pressure or volume is inadequate for function as specified.

31

D - HYDRAULIC SYSTEM (continued)

Hydraulic System Pressures:

 Steering Circuit 1500 p.s.i.
 Main circuit 2400 p.s.i.

Hydraulic System Flows:

 Main circuit 8 g.p.m.

(Main circuit flow determined by R.P.M.)

PROBLEM POSSIBLE CAUSE CORRECTION

NO LOADER LIFT

OR BUCKET

ROOLBACK

INAPPROPRIATE

LIFT SPEED

Inadequate pressure

Cold hydraulic fluid

Low engine R.P.M.

Inspect, clean or

replace relief valve

Warm hydraulic fluid by

running engine

Move throttle control to

fast position to

increase R.P.M.

TRA CTOR

LOOSES DRIVE

AND AUXILARY

POWER

Hydraulic components my

be loose from back of

engine

Inspect input shaft and

flywheel plate for

damage. Replace parts

if needed

STEERING

Most steering problems can be corrected if the problem is properly defined. The entire
steering system should be evaluated before removing any components. The steering
control unit is generally not the cause of most steering problems. The following is a list of
steering problems along with possible causes and suggested corrections.

PROBLEM POSSIBLE CAUSE CORRECTION

SLOW STEERING,

HARD STEERING

OR LOSS OF

POWER ASSIST

WANDERING,

VEHICLE W ILL

NOT STAY IN A

STRAIGHT LINE

DRIFTS-VEERS

SLOWLY IN ONE

DIRECTION

W orn or malfunctioning

pump

Malfunctioning relief valve

allowing system pressure

to be too low

Overloaded steering axle Reduce the load

Leaking or kinked load

sensing signal line

W orn mechanical linkage Repair or replace

Bending of linkage or

cylinder rod

Loose cylinder piston Repair or replace

Severe wear in steering

orbitrol

W orn or damaged steering

linkage

Replace pump

Replace the relief valve

Correc t

Repair or replace

Repair or replace

Replace linkage and

align front end

32

STEERING (continued)

-

PROBLEM POSSIBLE CAUSE CORRECTION

SLIP-SLOW

MOVEMENT OF

STEERING

WHEEL FAILS TO

CAUS E ANDY

MOVEMENT OF

STEERED

WHEELS

TEMPORA RY

HARD STEERING

OR HANG-UP

ERRATIC

STEERING

"SPONGY" OR

SOFT STEERING

FREE WHEELING-

STEERING

WHEEL TURNS

FREELY WITH NO

FEELING OF

PRESSURE AND

NO ACTION OF

STEERED

WHEELS

Leakage of cylinder piston

seals or accessory valve

between cy linder line or

ports

Worn steering control unit

meter

*Thermal shock

Air in sy stem due to low

level of oil, cavitation of

pump, leaky

fitt ing,pinched hose, etc.

Loose cylinder piston Replace cylinder

*Thermal shock damage

Sticking flow control

cartridge in gear pump

Air in hydraulic syst em.

Most likely air trapped in

cylinder or lines

Low fluid level

Steering column upper

shaft is loose or damaged

Steering control unit meter

has a lack of oil. This can

happen in start-up, after

repair, or long periods of

non-use

No flow to steering control

unit-- Can be caused by:

Low fluid level

Ruptured hose Replace hose

Replace seals or

accessory valve

Replace steering

control unit

Check unit for proper

operation and cause of

thermal shock

Correct condition and

add fluid

Replace steering

control unit

Replace flow control

cartridge or gear pump

Bleed air out of system

Add fluid and check for

leaks

Tighten steering wheel

nut

Usually starting engine

and allowing hydraulic

oil to circulate will cure

the problem

Add fluid and check for

leaks

Internal steeering control

unit damage due to

"Thermal Shock"

*Thermal Shock is defined on the following page.

33

Replace the steering

conrol unit

STEERING (continued)

-

PROBLEM POSSIBLE CAUSE CORRECTION

FREE WHEELING-

STEERING

WHEEL TURNS

WITH SLIGHT

RESISTANCE BUT

RESULTS IN

LITTLE OR NOT

STEERED WHEEL

ACTION

EXCESSIVE FREE

PLAY AT

STEERING

WHEEL

EXCESSIVE FREE

PLAY AT

STEERED WHEEL

STEERING UNIT

LOCKS UP

STEERING

WHEEL

OSCILLATES OR

TURNS BY ITSELF

STEERED

WHEELS TURN IN

WRONG

DIRECTION W HEN

OPERATOR

ACTIVATES

STEERING

WHEEL

ENGINE SOUNDS

LIK E IT IS UNDER

LOAD BUT FREES

WHEN STEERING

WHEEL IS

TURNE D

Cylinder piston seal blown

out

Loose steering wwheel

nut. Steering column shaft

worn or damaged. Ther

should be very little play in

the unit itself

Broken or worn linkage

between cylinder and

steered wheels

Leaking cylinder seals Replace cylinder seals

Large particles in meter

section

Insufficient hydraulic

power

Severe wear and/or broken

pin

*Thermal shock Replace the unit

Parts assembled wrong.

Steering unit improperly

timed

Lines connected to wrong

steering cylinder ports

O-rings in the load sense

relief cartridge are worn or

missing

Determine the cause.

Correct the cause and

replace the blown seal

Repair or replace

steering wheel

connection or column

Check anchor points in

steering linkage

between cylinder and

steered wheels

Clean the unit

Check hydraulic power

supply

Replace the unit

Correct timing

Reconnect lines

correctly

Replace o-rings

34

*Thermal Shock - A condition caused when the hydraulic system is operated for some
time without turning the steering wheel so that fluid in the reservoir and system is hot and
the steering control unit is relatively cool (more than 50*F temperature differential). When
the steering wheel is turned quickly the result is temporary seizure and possible damage
to internal parts of the steering control unit. The temporary seizure may be followed by total
free wheeling.

LOADER LIFT AND BUCKET ROLL BACK

The entire system should be evaluated before removing any components. The following is
a list of problems with possible causes and suggestions for correction.

NOTE:

 It is important to check the loader bucket stops periodically for damage. If the stops are

worn, the cylinder rods may come in contact with the bucket pin grease zerk.

 Check clearance between the rod and the zerk with the bucket rolled to the dump position.

There should be a minimum of 1/2" clearance. If not, you must weld on the stop to increase
clearance.

PROBLEM POSSIBLE CAUSE CORRECTION

SLOW LIFT OR

ROLL BACK,

LOSS OF POW ER

SURGING OF

LOADER AND

BUCKET ACTIONS

LOADER AND

BUCKET ACTIONS

TOO SLOW

Worn or malfunctioning

pump

Stuck relief valve cartridge Repair or replace pump

Worn pump allowing

system pressure to be

less than specified

Air in the system due to

low level of oil, cavitation

of pump, leaky fitting,

pinched hose, etc.
Worn or binding of

mechanical linkage

Bending of link age or

cy linder rod

Loose cylinder piston Repair or replace pump

Cold hydraulic fluid

Engine speed is too low Open throttle

Oil leaking past control

va lve

Oil too heavy Use recommended oil

Pump damaged or worn Repair or replace pump

Oil leaking past cylinder

seals

Dirty return oil filter Replace return oil filter

Faulty relief valve

Repair or replace pump

Repair or replace pump

Determine the cause

and correct the problem

Repair or replace pump

linkage

Repair or replace pump

Warm fluid with engine

at idle speed

Repair or replace worn

section

Replace seals

Clean or replace relief

va lve

35

LOADER LIFT AND BUCKET ROLL BACK (continued)

PROBLEM POSSIBLE CAUSE CORRECTION

LOADER FAILS TO

HOLD UP A LOAD

OIL

OVERHEATING

EXTERNA L

LEAKAGE

CYLINDER

MALFUNCTIONING

CONTROL VALVE

STICKING OR

WORKING HARD

Broken or leaking lines

Dirty hydraulic oil

Oil leaking past cylinder

seals

Oli leaking past control

va lve

Faulty relief valve

Dirty oil

Partially plugged suction

strainer

Control valve held open too

long

Worn pump Replace pump

Relief valve set too low

Oil too light for warm

weather

Engine R.P.M. too fast Reduce throttle setting

Damaged oil lines Replace damaged lines

Excessive oil flow over

relief valve from poor

operating techniques

Plugged or bent oil cooler

fins

Control valve tie bolts

loose (if equipped)

Damaged o-rings between

valve sections

Damaged o-rings on valve

spool

Cylinder seals damaged Repair cylinder seal

Damaged o-rings on valve

drop check

Broken oil lines Replace hose

Loose hydraulic fittings Tighten fittings

Oil leaks past seal Replace seal

Faulty relief valve Clean or replace valve

Dirty valve Clean valve

Scored bore or bent spool Replace valve section

Control linkage misaligned Correct misalignment

Return spring broken or

binding

Foreign matter in spool

bore

Replace defective hose

and check for leaks

Drain and refill oil,

replace filter

Replace seals

Repair or replace worn

section

Clean or replace relief

va lve

Drain and refill oil,

replace filter

Drain oil, clean suction

strainer and refill with

new oil

Return control to

neutral postion when

not in use

Reset relief valve

correctly

Use recommended oil

Learn smoother

operting techniques

Clean and or straighten

oil cooler

Torque bolts

sequentially-50, 70, 90

in/lb.

Replace o-ring between

valve sections

Repair control valve

Repair control valve

Replace spring

Clean bore

36

ISUZU HYDRAULIC SCHEMATIC

37

WIRING SCHEMATIC FOR OPTIONAL EQUIPMENT

38

WIRING SCHEMATIC FOR ISUZU 3CD1 ENGINE

39

SERVICE INFORMATION

The following information has been provided to assist in making minor adjustments that are
part of the routine maintenance of the TLB 6235 . To remain a safe and trouble free machine,
it is recommended to check the following points on a regular basis.

FORWARD/REVERSE PEDAL CREEP ADJUSTMENT

1. Lift the tractor off the ground (all wheels) and support with jackstands.

2. Remove the retaining ring on the ignition switch using a suitable tool such as channel lock
pliers.

3. Remove two 1/4” trusshead screws from each side of the steering column cover panel and
one1/4” trusshead screws retaining the top of the panel through the dashboard. Remove
the cover panel.

4. Remove two 1/4” trusshead screws retaining the floor plate to the tractor frame and lift off
floor plate.

5. Locate the link arm from the pedal to the hydrostat control arm. Remove the bolt from the
3/8” straight yoke in the forward/reverse arm. The hydrostat has an internal centering
mechanism and will automatically center itself. Adjust the yoke inward or outward until the
bolt can be replaced back through the forward/reverse arm without actuating the hydrostat
control arm. Reinstall nut and tighten. (Do not overtighten yoke. Ensure free movement).

6. Reinstall the floor plate with the two truss head screws removed earlier.

7. Reinstall the steering column cover panel using five truss head screws removed earlier.

NOTE: Refer to the TLB 6235 exploded view drawing on page 29 to get

a better understanding of how the parts are assembled before attempting to make any
adjustments. Space is limited in this area and knowing what to look for is quite helpful.

PARK BRAKE ADJUSTMENT

1. Remove the stop screw, on the top of the park brake handle end cap, and turn cap clock­wise to increase the brake tension.

2. Replace the stop screw.

If adjustment of the park brake handle does not increase the brake tension, adjustment at the
front axle actuator is required. The following information will describe how to adjust the park
brake actuator.

1. Using a 7/8" open end wrench, loosen the top lock nut on the brake cable assembly (9).
Turn the lower lock nut towards the end of the cable one complete turn of the nut.

2. Tighten the top lock nut and check park brake tension. If tension is too tight, loosen the end
cap on the park brake handle to fine tune to the desired amount of tension. If tension is too
loose, rework step #1 until desired amount of tension is acquired.*

*Refer to the exploded view on the following page for clarification.
Helpful Hint: Lengthening the cable will tighten the park brake, shortening the cable will
loosen the park brake.

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TLB 6235

FORWARD/REVERSE PEDAL CREEP ADJUSTMENT

PARK BRAKE ADJUSTMENT

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SA/HR Park Brake Testing Instructions

1. Mount tractor on Jack Stands to allow the

wheels to spin freely (See Figure 75).

2. Start the Engine. Make sure that all 4

wheels rotate in forward and reverse.

3. Turn off the engine.

4. Unhook the quick coupler from the brake

that was previously installed (See Figure

76).

5. Start the Engine.

6. Actuate the pedal.

7. Make sure that all 4 wheels do NOT rotate

in forward or reverse. If the wheels rotate
then refer to the installation instructions.

FIG. 75

8. Turn off the engine.

9. Reinstall the quick coupler. This will

complete the TLB 6235 SA/HR Park Brake
Installation. Your Allmand TLB is now ready
to be put back into service.

SA/HR Park Brake Towing Instructions

1. Disconnect the quick coupler from the

brake (See Figure 76).

2. Reconnect the brake to a hydraulic hand

pump (See Figure 77).

3. Pump the hydraulic hand pump to ap-

proximately 200 psi.

FIG. 76

4. Start tractor. Make sure the wheels rotate

freely, if they do then the tractor is ready for
towing.

FIG. 77

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