Section 6
Hydraulic System
20425603
5-2005/Rev 0
6-6
Motor Maintenance
The motor should be inspected at regular intervals, approximately every 500 hours of operation or
every three months, whichever occurs first. Keep the motor clean and the ventilation openings
clear.
NOTE
Motor bearings are sealed for life and require no periodic maintenance.
Flexible Coupling Replacement
When the flexible coupling fails, the pump shaft will not turn and pressure will not be created.
Typically, failure will be sudden, without any warning signs.
The electric motor and hydraulic pump are mounted in tandem on both single and redundant
models. On redundant models, the hydraulic manifold is mounted on the hydraulic pump and
must be removed to replace the flexible coupling as described in the following procedure.
1. Turn the machine off and observe the appropriate Lockout/Tagout procedures.
Severe injury can result if the machine is not properly locked out. Observe
electrical Lockout/Tagout procedures before proceeding.
Ensure all pressure is relieved or blocked from the hydraulic and high pressure
circuits before proceeding.
2. Drain the hydraulic reservoir by connecting the inlet hose from an oil transfer pump to the
drain valve on the reservoir. Open the shutoff valve on the drain and pump the used oil
out to a container. Close the shutoff valve and remove the inlet hose from the drain valve.
Do not reuse the removed oil. It is recommended that the empty reservoir be
flushed with a few gallons of clean oil to remove settled debris from the bottom.
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