Section 6
Hydraulic System
20425603
5-2005/Rev 0
6-9
REDUNDANT MODELS
Install the hydraulic manifold ensuring that the o-ring is properly positioned.
Torque the mounting bolts to 35 ft-lbs (47 Nm).
Reconnect the sensors and connections to the manifold.
17. Reconnect all hydraulic hoses, connections and electrical leads.
18. Refill the hydraulic reservoir following the procedure, Hydraulic Oil Replacement.
19. Check the motor rotation. If the motor shaft is rotating in the wrong direction, reverse one
pair of motor leads.
20. Start the motor and apply full high pressure water pressure. Inspect for hydraulic leaks
and note any unusual sounds from the motor or pump assembly.
Hydraulic Oil Replacement
Hydraulic oil must only be removed and replaced at the fill port on the filter head.
1. Remove the cap from the fill port on the oil filter.
To ensure cleanliness, the oil fill port must be used to pump oil into the reservoir.
Filling at this point guarantees the hydraulic oil will pass through the oil filter
before entering the reservoir.
2. Connect the discharge hose from an oil transfer pump to the fill port and pump the fresh
oil into the reservoir.
NOTE
Oil from a new drum does not meet the cleanliness requirements of the hydraulic
system. For this reason, it is important to use an oil transfer pump that will force
oil through the return filter into the reservoir.
3. Check the oil sight gauge on the reservoir to ensure proper fill level.
4. Remove the hydraulic hose from the case drain on the hydraulic pump to make sure the
pump case fills with oil. With the hose removed, head pressure from the reservoir will
force oil into the pump case.
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