Gradall 534D-6T Service Manual - Manual (Page 263)

F ORM N O. 29813 • I MPLEMENT C IRCUIT P ERFORMANCE C HECKS (C & D Series Material Handlers)
• SET UP
1. Install a 1,000 PSI pressure gauge, hose and adapter on the
charge pump test port.
2. Make sure the gauge can be observed in the operator’s cab.
• CHECK
1. With the park brake engaged and the transmission in “Neutral”,
start the engine and run at low idle (800-900 RPM). The gauge
should read no less than 320 PSI.
2. At full throttle (2500 +150/-0 RPM), the gauge should read a
maximum of 480 PSI and never less than 320 PSI.
• ADJUST
1. Before attempting any adjustment, you must switch the engine
off! Also, make sure the park brake is still engaged.
2. To adjust the charge pump relief valve, remove the cap and
loosen the locknut.
3. Turn the adjusting screw clockwise to increase charge pressure.
4. Turn the adjusting screw counter-clockwise to reduce charge
pressure.
5. Be sure to note the amount that the relief turns in either direction.
6. When finished, tighten the locknut and install a blue plastic cap.
7. To locate the loss of charge pressure, refer to the appropriate
Hydrostatic Drive Performance Checks Manual under the “Charge
Pressure” section.
NOTE!
For more details, see page 73
of the Material Handler
Hydraulic System Manual
(Form No. 29101).
4.0
C
HARGE
P
RESSURE
(Also used as Pilot Pressure on Joystick Machines)
D SERIES: CHARGE PUMP TEST PORT
(HOSE ATTACHED)
C SERIES: CHARGE PUMP TEST PORT
522, 524, 532C-6, 534C-6 and 534C-6T
CHARGE PUMP RELIEF VALVE
ALL OTHER MODELS
CHARGE PUMP RELIEF VALVE
NOTE!
The location of the charge
pump test port varies by
machine vintage.
NOTE!
The location of the charge
pump relief valve varies by
machine vintage.