Challenger Terra Gator 3244 Chassis. Manual - part 121

Introduction

7-4

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FIG. 5: Hydraulic oil tank (1) is located behind the Cab.

The hydraulic tank is filled with 200 L  (52.8 gall).

Hydraulic oil is drawn out of tank by gear pump through

suction strainer. Oil from application system is returned

into tank through filter on top of the tank.

FIG. 6: Hydraulic oil pump (2) is mounted on the left

PTO of the gearbox.

The hydraulic pump is a displacement gear pump. The

pump draws oil from the reservoir and sends oil flow to

the priority valve.

FIG. 7: The priority valve (3) is mounted underneath

the Cab.

The priority valve direct hydraulic flow between the

steering system and the application systems, including

the pressure washer if equipped. A load sense signal

from the steering unit shift the valve to allow hydraulic

flow to exit the control flow (CF) port. If there is no load

sense signal, the priority valve shifts to allow hydraulic

flow to exit the excess flow (EF) port.

FIG. 5

Q000092S

1

FIG. 6

2

q000139s

FIG. 7

q000094s

3

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Introduction

FIG. 8: The steering unit (4) is mounted to the front of

the cab.

The steering unit is a closed center distribution valve

that is connected to the steering wheel in the Terra

Gator. When the operator turns the steering wheel, the

unit sends a load sense signal to the priority valve on

the pump. This will send an amount of flow (CF-port)

through the steering unit to the 2 steering cylinders. 

The speed and/or turning angle of the steering wheel

depends the amount of flow, that’s send through the

steering unit to the 2 steering cylinders.

FIG. 9: The 2 accumulators (9) are mounted to the

front of the cab, underneath the Steering unit.

The accumulators make it possible, when there is a

failure to the hydraulic pump. The machine still can

brake 8 times.

FIG. 10: The heat exchangers

The hydraulic oil cooler is mounted to the front of the

radiator assembly. The cooler cools hydraulic oil

returned from the application systems hydraulic system

and the pressure washer, if equipped. The cooled oil is

send to the return filter and into the tank.

1. Transmission Cooler;

2. Hydraulic Cooler;

3. Air Conditioner Condenser;

4. Charge Air Cooler;

5. Engine Radiator.

FIG. 8

Q000095S

4

FIG. 9

q000140s

9

9

FIG. 10

Q000106S

4

5

1

2

3

Introduction

7-6

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FIG. 11:

m

WARNING: The cooling system operates

under pressure which is controlled by the

radiator pressure cap. Removing the cap

while the system is hot may allow the

escape of hot coolant and steam, causing

serious burns. Before you remove the

radiator cap, allow the system to cool.

Use a think cloth and turn the radiator

cap slowly to the first stops to allow

pressure to escape before fully removing

the cap. Avoid contact with coolant.

FIG. 11

Q000126S

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Introduction

PRESSURE MEASUREMENT

NOTE: Components must be clean. Before

disassembly procedure, exterior of component

should be thoroughly cleaned to prevent dirt

from entering internal mechanism or system.

IMPORTANT: Ensure fluids are contained during

performance of inspection, maintenance,

testing, adjusting and repair of machine. Be

prepared to collect fluid with suitable

containers before opening any compartment or

disassembling any component containing

fluids.
Dispose of all fluids according to local

regulations and mandates.

m

WARNING: Personal injury can result

from hydraulic oil pressure and hot oil.

Hydraulic oil pressure can remain in

hydraulic system after engine has been

stopped. Serious injury can be caused if

this pressure is not released before any

service is done on hydraulic system.

Ensure all implements have been lowered

to ground and oil is cool before removing

any components or lines. Remove oil

filler cap only when engine is stopped

and filler cap is cool enough to touch with

bare hand.

NOTE: Put identification marks on all lines, hoses and

tubes to ease installation. Plug all lines, hoses

and tubes to prevent fluid loss and prevent

contaminants from entering hydraulic system.

Steering System

FIG. 12: The test point (1) of the steering system is

located on top of the Steering unit.

The pressure on the system has to be 190 bar (2756

psi).

FIG. 12

q000145s

1