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Hydraulic oil pressure can remain in the hydraulic system on this machine after the engine and pump have been stopped. Serious injury can result if this pressure is not released before any service is done on the hydraulic systems. In order to prevent possible injury, release the hydraulic system pressure before working on any fitting, hose, or hydraulic component. Lower all attachments to the ground before service is started. If the hydraulic system must be serviced, tested, or adjusted with the attachment in the raised position, the attachments and lift cylinders must be supported properly. Always move the machine to a location away from the travel of other machines. Be sure that other personnel are not near the machine when the engine is running and tests or adjustments are being made. |
| NOTICE |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Dispose of all fluids according to local regulations and mandates. |
| Brake and Clutch Pressure | |||
| Date | Equipment ID Code | ||
| Position | Item | Specification | Actual |
| Brake Off | Brake Pressure | |
|
| Brake Off | Clutch Pressure | |
|
| Hand Control Half On | Brake Pressure | |
|
| Clutch Pressure | <70 | ||
| Hand Control Full On | Brake Pressure | |
|
| Clutch Pressure | <70 | ||
The control valve for the brake and the clutch controls the steering of the tractor.
The valve may require adjustment if one of the following conditions exist:
- The tractor makes a turn without steering input.
- The steering of the machine is erratic.
- The machine has a smaller turning radius in one direction versus the other direction.
Use the following procedure to set the valve correctly.
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| Illustration 1 | g06221007 |
|
Tooling (T1) 198-4240 Digital Pressure Indicator Gp | |
| Required Tools | ||||
|---|---|---|---|---|
| Tool | Item | Qty | Part No | Description |
| T1 | 198-4240 | Digital Pressure Indicator Gp | ||
| T1a | 1 | 198-4234 | Digital Indicator | |
| T1b | 1 | 198-4237 | Pressure Sensor Gp
(0 to 3,445 kPa (0 to 500 psi)) |
|
| T1b | 1 | 198-4238(1) | Pressure Sensor Gp
(0 to 34,450 kPa (0 to 5,000 psi)) |
|
| T1b | 1 | 198-4239 | Pressure Sensor Gp
(0 to 41,368 kPa (0 to 6,000 psi)) |
|
| T1c | 1 | 198-4236 | Adapter Cable As | |
| (1) | This sensor must be purchased separately. The sensor is not included in the 198-4240 Digital Pressure Indicator Gp |
- Move the machine to a flat open area.
- Lower all implements to the ground.
- Stop the engine.
- Turn the key to the ON position, but do not start the engine.
- Verify that the implement shutoff control is in the UNLOCKED position.
- Move the implement control levers and the transmission control lever through the full range of travel several times. This movement should relieve any pressure that may be present in the implement hydraulic system and the power train system.
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Illustration 2 g06248086 (B1) Left Brake
(B2) Right Brake
(C1) Left Steering Clutch
(C2) Right Steering Clutch - Install tooling (T1) on the pressure tap being tested.
- Install tooling (T1) on a pressure taps (B1) and (B2).
- Start the engine and run at HIGH IDLE.
- Make sure that the transmission is in the NEUTRAL position.
- Using tooling (T1), check pressure for pressure taps (B1) and (B2). The pressure should be
2482 ± 172 kPa (360 ± 25 psi) . - Install tooling (T1) on a pressure taps (C1) and (C2).
- Using tooling (T1), check pressure for pressure taps (C1) and (C2). The pressure should be
2585 ± 138 kPa (375 ± 20 psi) .
Adjustment Procedure - Brake Off
- The pressures are adjusted by loosening the locknut (5) and turning the adjustment screw.
Note: Adjustment screws (2) and (3) are used for adjusting the brake pressure.
Note: Adjustment screws (1) and (4) are used for adjusting the clutch pressure.
- If the specified control pressures cannot be attained, remove
0.50 mm (0.02 inch) of shim (6) or (7) from the spool. - Readjust the control pressure.
- Repeat steps 1 through 3 for all the pressures.
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| Illustration 3 | g06257423 |
|
Steering And Brake Control Valve (1) Adjustment screw for the left clutch (2) Adjustment screw for the left brake (3) Adjustment screw for the right brake (4) Adjustment screw for the right clutch (5) Locknut (6) 7G-3046 Shim (7) 7G-3177 Shim | |
Test Preparation - Hand Control Half On
Perform the steps in "Test Preparation - Brake Off".
Test Procedure - Hand Control Half On
Note: After the control pressures have been adjusted, check the clutch pressure and the brake pressure at the following control lever position.
- Pull the levers backward until a higher lever force is felt.
- The control levers at this position should produce a clutch pressure of <70 and a brake pressure of
2482 ± 172 kPa (360 ± 25 psi) .
Test Preparation - Hand Control Full On
Perform the steps in "Test Preparation - Brake Off".
Test Procedure - Hand Control Full On
Note: After the control pressures have been adjusted, check the clutch pressure and the brake pressure at the following control lever position.
- Pull the levers all the way backward.
- The control levers at this position should produce a clutch pressure of <70 and a brake pressure of
293 ± 120 kPa (43 ± 17 psi) .