Grove RT9130E - Procedure G - for Pre-Charging Accumulator; Procedure H - for Checking Front Steer Relief Valve Pressure

Published 08-25-09, Control # 077-04 2-25
RT9130E SERVICE MANUAL HYDRAULIC SYSTEM
2
GROVE
9. Hold gas valve to keep it from turning. Loosen swivel nut
and remove charging assembly. Reinstall gas valve cap
and guard.
Procedure G - For Pre-Charging
Accumulator
1. With the engine off, discharge all oil stored in the
accumulators by pushing the service brake pedal
several times. Remove the gas valve guard and gas
valve cap on the accumulator (Figure 2-12).
2. Check that the nitrogen supply bottle valve is shut off,
then attach charging assembly hose to nitrogen bottle.
3. Before attaching charging assembly (Figure 2-12) to the
accumulator gas valve, back the gas chuck “T” handle
all the way out (counterclockwise).
4. Close the charging assembly bleed valve. Without
twisting hose, attach the swivel nut onto the gas valve
and tighten to 10-15 inch-pounds (1.1 to 1.7 Nm).
5. Turn the gas chuck “T” handle all the way down
(clockwise) to depress the core in the gas valve.
6. Crack open the nitrogen bottle valve and slowly fill the
accumulator. Shut off the valve when the pre-charge
pressure is 9.7 + 0.4/-0 MPa (1400 +50 PSI/-0).
7. If the pre-charge pressure is higher than 9.7 + 0.4/-0
MPa (1400 + 50/-0 PSI), then close the nitrogen bottle
valve and slowly open the bleed valve on the charging
assembly (Figure 2-12) until the pre-charge pressure is
correct.
8. Remove charging assembly by turning “T” handle all the
way out (counterclockwise) on gas chuck and then open
bleed valve.
9. Hold gas valve to keep it from turning, loosen swivel nut,
and remove charging assembly. Replace gas valve cap
and guard.
Procedure H - For Checking Front Steer
Relief Valve Pressure
1. Remove cap and install pressure gauge on steer valve
load sense test port (Figure 2-13).
2. With the engine running @ 1000 RPM, turn the steering
wheel to LOCK position and adjust pressure at the steer
priority flow divider section relief to 17.2
± 0.4 MPa (2500
± 50 PSI).
3. Remove pressure gauge from the Load Sense Test Port
and reinstall cap.
FIGURE 2-13
7128-4
Swing/Steer Directional Control Valve
1
2
3
4
5
Item Description
1 Steer Priority Flow Divider Section Relief
2 Steering Load Sense Test Port
3 Swing Inlet Test Port
4 Swing Relief “A” Port
5 Swing Relief “B” Port
Item Description