UNDER CARRIAGE 777 SERVICE MANUAL
8-4 Published 10-01-2012, Control # 045-08
HYDRAULIC HAND PUMP
See Figure 8-4 for following procedures.
Assembly
1. Connect hose from pump outlet port to cylinder inlet.
2. Use 1-1/2 wraps of a high-grade thread sealant on
fittings (for example, Teflon tape).
Do not apply sealant to first complete thread to
ensure tape does not shed into hydraulic system
and cause malfunctioning or damage.
3. Do not overtighten connections. Connections only need
to be snug and leak free. Overtightening can cause
premature thread failure and may cause fittings or
castings to split at lower than their rated pressures.
Maintenance
1. Keep unit clean and stored in a safe place where it
cannot be damaged.
2. Keep oil in pump at proper level. Check level as follows:
a. Open valve and fully retract cylinder rod to return all
oil to pump. Cylinder must be fully retracted or
system will contain too much oil.
b. For Simplex pump:
- Place pump in horizontal position on a flat
surface.
- Using a screw driver, remove vent/fill cap.
- Add hydraulic oil until reservoir is 2/3 full. Do
not overfill.
- Securely reinstall vent/fill cap.
c. For Enerpac pump:
FIGURE 8-3
A1052
Item Description
1Bolt
2Cover
3 Jack Cylinder
4 Support
5Rod
6
Shims — 0.134 in (3 mm) and
0.250 in (6 mm) Thick
7Tread
8Front Roller
9 Center Punch Line B
10 Center Punch A
11 Hand Pump
5
1
6
7
8
9
2
3
4
11
10
WARNING
Prevent Possible Death or Serious Injury
to Maintenance Personnel
Manitowoc has provided hand pump and cylinder for
crawler adjustment only. Any other use is neither intended
nor approved.
Wear safety glasses and other personal protective gear
when operating hand pump.
Do not exceed maximum pressure rating of components
(pump, cylinder, hose) – 10,000 psi (700 bar). Higher
pressure can cause components to explode.
Do not set pump relief valve higher than 10,000 psi (700
bar). Higher pressure can cause components to explode.
Pump is not vented. It can explode if subjected to high
pressure. Do not attempt to return more oil to pump than it
is capable of holding. Do not overfill pump.
In some cases, pump handle can kickback. Always keep
your body to side of pump, away from line of handle force.
Do not add extensions to handle. Extensions can cause
unstable operation.
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