Manitowoc Published 10-01-2012, Control # 045-08 10-43
777 SERVICE MANUAL TROUBLESHOOTING
10
Test 13 – Setting Pump Neutral
To set pump neutral, set the pawls and brakes, and disable
the pump from the PC by disconnecting the PC cable at the
EDC. Install a 500 psi gauge in each of the servo gauge
ports. Start and operate the engine at normal speed. Loosen
the lock nut and rotate the neutral adjustment screw with a
hex wrench until pressure increases in one of the gauges.
Note the handle position of the hex wrench and without
removing the wrench, rotate the neutral adjustment screw
counterclockwise until pressure increases in the other
gauge. Note the position of the hex wrench and rotate the
neutral adjustment screw clockwise halfway between the
wrench positions. The control should now be in neutral with
both gauges reading the same case pressure. While holding
the neutral adjustment screw with the hex wrench, tighten
the lock nut. Remove the gauges and reinstall the servo
gauge port plugs.
Item Description
1 Neutral adjustment screw
2 Servo gauge ports
2
P966
FIGURE 10-18
1
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