Section 5
Recirculation System
20479279
9-2010/Rev 02
6-6
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.
1. Start the pump in recirculation mode, count two seconds and turn the pump off.
2. Repeat this process six times before allowing the hydraulic pump to create pressure.
Oil Filter Maintenance
If the filter element is not properly serviced and is allowed to fill with debris, the oil will be
forced through the relief valve, bypassing the filter. The bypass relief valve opens at 50 psi (3.4
bar).
The filter element must be replaced when the pressure gauge reading is 40 psi (2.8 bar) or greater
during normal operating conditions. Normal operating conditions indicate the machine is running
and the oil temperature has reached 115 F (46 C).
Figure 5-5: Oil Filter Assembly
1. Use a filter wrench to unscrew the filter element from the filter head. Make sure the old
gasket is removed with the element.
2. Lubricate the gasket on the new element with fresh oil.
3. Use the filter wrench to screw the new element onto the filter head and hand-tighten. Do
not over tighten.
4. Start the machine and check for leaks.
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