Manitowoc Published 10-01-2012, Control # 045-08 8-5
777 SERVICE MANUAL UNDER CARRIAGE
8
- Place pump in vertical position with hose end
down.
- Using a screw driver, remove vent/fill cap.
- Add hydraulic oil until it is at mark on dipstick.
Do not overfill.
- Securely reinstall vent/fill cap.
d. Test operation and remove air from system, if
required. Recheck level after removing air.
Air Removal
1. Close valve finger tight only.
2. Position pump higher than cylinder and position cylinder
so rod is down.
3. Operate pump to fully extend cylinder rod.
4. Open valve and retract cylinder rod to force oil and
trapped air back into pump.
5. Repeat steps until cylinder operates smoothly. Erratic
operation indicates air in system.
Operation
1. Before using pump:
a. Check that all fittings are tight and leak free.
b. Check oil level.
2. To pressurize cylinder and extend rod, close valve by
turning clockwise until finger tight only. Then pump
handle up and down.
Pressure will be maintained until valve is opened.
To reduce handle effort at high pressure, use short
strokes. Maximum leverage is obtained in last five
degrees of stroke.
3. To depressurize cylinder, push handle down fully and
open valve by turning counterclockwise.
4. Pump can be operated in any position from horizontal to
vertical as long as hose end of pump is down.
S135
Extend
Retract
Cylinder
Cylinder
Close
Valve
Open
Valve
S137
S138
Notch in Dipstick
(Enerpac Pump)
Hose
Cylinder
Pump
Vent/Fill Cap
(Simplex Pump)
OR
FIGURE 8-4
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