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Hydraulic accumulator contains gas and oil under high pressure. Improper removal or repair procedures could cause severe injury. To remove or repair, instructions in the service manual must be followed. Special equipment is required for testing and charging. |
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Personal injury or death can occur if steering is lost completely during operation. Do not continue to operate the machine using the secondary steering. If the secondary steering activates during operation, immediately park the machine in a safe location. Inspect the machine and correct the condition which made the use of the secondary steering necessary. |
This machine is equipped with a secondary steering system. The hydraulic steering accumulators provide a limited amount of stored hydraulic pressure for steering if the power source for the normal steering system fails or the engine stops. The secondary steering system will only provide steering until the stored hydraulic pressure is exhausted from steering action by the operator.
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| Illustration 1 | g02004735 |
| (1) Steering accumulators | |
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| Illustration 2 | g02004715 |
Perform the following field test to verify that the secondary steering system is functional. Perform the test when the dump body is empty.
Note: To perform this procedure, the rear wheels must be chocked but the front wheels should not be chocked.
- Prepare the machine for maintenance. This task requires the engine to be running. Refer to "Operation and Maintenance Manual" , Prepare the Machine for Maintenance.
- When the engine is stopped with the engine start switch and the shift control lever in the P position, check the steering hydraulic oil level. Maintain the oil within green range (A) of upper sight gauge (2).
- After engine start-up and the machine lockout control activated, check the oil level.
- If the oil level within green range (B) of lower sight gauge (3) is proportional to the oil level within the green range of the upper sight gauge level in step 2, the accumulators are properly charged.
- If the oil level is below the green range in the lower sight gauge, check accumulator charge before proceeding to the next step. Refer to System Operation, Testing and Adjusting, KENR8574, "793F Off-Highway Truck Steering System", "Accumulator (Steering) - Test and Charge" or consult your Cat dealer.
- Turn the front wheels to the straight ahead position.
- Move the transmission control to the N position.
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Illustration 3 g06228239 - Stop the engine with ground level shutdown switch (4). This permits the accumulators to stay charged to provide stored energy for the secondary steering system when the engine is stopped.
- With all personnel clear of the machine, visually confirm the following:
- Verify that the front wheels turn left as the steering wheel is turned left.
- Verify that the front wheels turn right as the steering wheel is turned right.
If the secondary steering system is unable to comply with any portion of this field test, consult your Cat dealer.