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Challenger Terra Gator 3244 Chassis. Manual - part 24

627333-A

3-9

Transmission and Solenoids

Transmission System

1. Inching Pedal;

2. Shift Lever;

3. Auto Switch;

4. Filter;

5. Charge Pump;

6. Suction Filter;

7. Transmission ECM;

8. Main Relief Valve;

9. Oil Cooler;

10. Cooler Bypass;

11. Transmission;

12. Modulating Valves;

13. Lube Relief Valve;

14. Sump;

15. Charge Pressure;

16. Sump;

17. Lube Pressure.

The operator can intiate a hydraulic function by using

one of the following controls:

•

Inching Pedal (1);

•

Shift Lever (2);

•

Auto Shift Switch (3).

Oil from sump (14) is drawn through suction filter (6) by

the charge pump (5). Suction filter (6) is rated at 200

micron. Hydraulic oil filter (4) filters the oil from charge

pump (5).

Filtered oil is supplied to following valves:

•

Modulating valves (transmission) (11);

•

Relief valve (8).

When the modulating valves are energized, oil flows to

the transmission clutches. When the modulating valves

are de-energized, oil flows from the valve to the sump.

The relief valve (charge pressure) regulates the

pressure in the transmission hydraulic system to a

maximum pressure of 2100 kPa (305 psi).

Excess oil flows from relief valve (8) (charge pressure) to

hydraulic oil cooler (9). Cooler bypass valve (10) will

open if a pressure of 520 kPa (75 psi) is felt at the input

side of the hydraulic oil cooler. Normally, the cooler

bypass valve will remain closed unless there is a

restriction in the hydraulic oil cooler or if the oil is very

cold.

Oil from transmission oil cooler (9) flows to the

transmission for lubrication of the clutches. The

transmission lubrication relief (13) regulates the oil

pressure for lubrication to 275 kPa (40 psi).

FIG. 9

Q000045S

Transmission and Solenoids

3-10

627333-A

Electrical System

The transmission electrical system provides controls for

the transmission hydraulic system. The transmission

electrical system includes switches, sensors, and

control levers. The input signals are processed by the

transmission electronic control module (ECM) which

then energizes the appropriate solenoid.

The transmission electrical system contains the

following components:

•

Transmission ECM;

•

Control inputs;

•

Solenoids.

The transmission hydraulic system provides a

modulated flow of pressurized oil to the transmission.

The transmission contains nine transmission clutches

are controlled by the nine corresponding modulating

valves (transmission). The transmission provides the

operator with 16 forward and 3 reverse gears.

627333-A

3-11

Transmission and Solenoids

Transmission Electrical Control System

1. Shift Lever Position Sensor;

2. Inching Pedal Switch;

3. Inching Pedal Position Sensor;

4. Input Speed Sensor;

5. Output Speed Sensors;

6. Hydraulic Oil Temperature Sensor;

7. Charge Pressure Sensor;

8. Auto Shift Switch;

9. CAT Data Link;

10. Service Connector;

11. Transmission ECM;

12. Dash Panel Display;

13. CAN Date Link;

14. Modulating Valve;

15. Modulating Valve;

16. Modulating Valve;

17. Modulating Valve;

18. Modulating Valve;

19. Modulating Valve;

20. Modulating Valve;

21. Modulating Valve;

22. Modulating Valve;

23. Service Connector.

CAT date link (13) is a serial communication bus that is

used in order to communicate with the following

components:

•

Engine ECM;

•

Transmission ECM;

•

Dash Panel Cluster;

•

Other OEM electronic modules

Shift lever (3) sends a PWM signal to transmission ECM

(11). Transmission ECM (11) processes the signal in

order to determine the position of the lever.

Speed sensors (5), temperature sensor (6), and

pressure sensor (7) send signals to transmission ECM

(11). The transmission ECM uses the signals order to

monitor the conditions of the transmission.

FIG. 10

Q000035S

Transmission and Solenoids

3-12

627333-A

MODULATING VALVE

FIG. 11: Nine modulating valves (1) are located on the

left side of the transmission and on the front of the

transmission.

Each modulating valve has a designated letter, as

shown. The letters have been cast into the

transmission case. The designated letters are used to

correlate the modulating valve to the corresponding

transmission clutch.

An inspection hatch is located behind the right front

wheel. Through this inspection hatch there is an easy

access to the modulating valves. To reach the

inspection hatch the right front wheel has to be

removed.

FIG. 12:

WARNING: Escaping fluid under

pressure, even a pinhole size leak, can

penetrate body tissue, causing serious

injury, and possible death. If fluid is

injected into your skin, it must be treated

immediately by a doctor familiar with this

of injury.

Always use a board or cardboard when

checking for a leak.

WARNING: Personal injury can result

form hydraulic oil pressure and hot oil.

Hydraulic oil pressure can remain in the

hydraulic system after the engine has

been stopped. Serious injury can be

caused if this pressure is not released

before any service is done on the

hydraulic system.

Make sure all of the attachments have

been lowered, oil is cool before removing

any components or lines. Remove the oil

filler cap only when the engine is

stopped, and the filler cap is cool enough

to touch with your bare hand.

FIG. 11

Q000037S

FIG. 12

Q000119S

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