Manitowoc Published 10-01-2012, Control # 045-08 10-45
777 SERVICE MANUAL TROUBLESHOOTING
10
Test 15 – Checking Pump Charge Pressure
The most convenient method of measuring the pump charge
pressure is to install a 0-500 psi gauge at the desired
system diagnostic gauge coupler at the transducer manifold
assembly. Start the system and record the charge pressure
at engine idle speed. No hydraulic systems should be
energized. A measurement of 350 psi is normal charge
pressure. A measurement under 350 psi indicates a charge
pressure relief adjustment is necessary. See Test 14.
Item Description Item Description
1 Left Track Forward/Reverse 6 Boom Hoist Pump (Boom Up)
2 Right Track Forward/Reverse 7 Front Load Drum Hoist
3 Swing Left 8 Rear Load Drum Hoist
4 Swing Right 9 Auxiliary Load Drum Hoist (optional)
5 Boom Hoist Cylinder (Boom Up)
Electrical
FIGURE 10-20
Diagnostic
Gauge Couplers
P697
DIN Connector
1 23 54 6 87 9
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