Section 6
Recirculation System
20412963
8-2012/Rev 07
6-6
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.
5. Connect the discharge hose from the oil transfer pump to the fill port and pump the fresh
oil into the reservoir.
NOTE
If 3/4-inch BSPP threads are required, install the adapter located on the inside of
the frame. When filling is complete, remove the adapter and install the fill port
cap.
6. Check the oil sight gauge on the reservoir to ensure proper fill level.
7. Remove the hose from the case drain on the main 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.
Oil in the pump case provides internal lubrication for the main hydraulic pump.
Failure to the fill the pump case with oil will allow air to become trapped inside,
damaging the pump.
8. Disconnect the discharge hose from the fill port and replace the fill port cap.
9. Follow the initial start up sequence in Section 4, Operation, to ensure the system is filled
with oil.
10. Check the sight gauge again and follow the same procedure to add additional oil if
necessary.
Electric Motor Bump
Bumping is defined as allowing the electric motor to start rotating, but stopping it before the
motor gets up to full speed.
Whenever the hydraulic reservoir is emptied or the hydraulic pump has been changed, bumping
the electric motor is suggested. This procedure will ensure the hydraulic pump is full of oil and
deter cavitation which will cause the hydraulic pump to fail prematurely.
Do not perform this procedure until the correct motor rotation and the presence of hydraulic oil in
the hydraulic pump case drain line has been confirmed.
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