Manitowoc Grove RT765E-2, Руководство по обслуживанию и ремонту

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2-27
GROVE
RT765E-2 SERVICE MANUAL HYDRAULIC SYSTEM
2
Published 9-04-2014, Control # 422-08
3. Close the charging assembly bleed valve. Attach the
swivel nut onto the gas valve and tighten to 10 to 15 lb-in
(1.1 to 1.7 Nm).
4. Turn the gas chuck “T” handle all the way down
(clockwise) which will depress the core in the gas valve.
5. Check the pre-charge pressure. It should be 900 psi
+50/-0 (6.2 MPa +0.4/-0).
6. If the pressure is 900 psi +50/-0 (6.2 MPa +0.4/-0),
remove the charging valve assembly by turning the “T”
handle all the way out on the gas chuck and then
opening the bleed valve Figure 2-11.
7. Hold gas valve from turning. Loosen swivel nut and
remove charging assembly. Reinstall gas valve cap and
guard.
8. Repeat for other accumulator.
Procedure H - PreCharging The Accumulator
1. With the engine off, discharge all of the pressurized oil
stored in the accumulators by depressing the service
brake pedal on the cab floor several times. Remove the
gas valve guard and gas valve cap on the accumulator
Figure 2-11.
2. Ensure that the nitrogen supply bottle is shut off, then
attach the charging valve assembly to it.
3. Before attaching the charging assembly Figure 2-11 to
the accumulator gas valve, back the gas chuck “T”
handle all the way out (counterclockwise).
4. Close the charging assembly bleed valve. Without
looping or twisting the hose, attach the swivel nut to the
accumulator gas valve and tighten to 10 to 15 lb-in (1.1
to 1.7 Nm).
5. Turn the gas chuck “T” handle all the way in (clockwise),
which will 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 900 psi +50/-0 (6.2 MPa +0.4/-0).
7. If the pre-charge pressure is higher than 900 psi +50/-0
(6.2 MPa +0.4/-0), close the nitrogen bottle valve and
slowly open the bleed valve on the charging assembly
Figure 2-11 until the pre-charge pressure is correct.
8. Remove the charging assembly by turning the “T”
handle all the way out (counterclockwise) on the gas
chuck and then open the bleed valve.
9. Hold gas valve from turning. Loosen the swivel nut and
remove the charging assembly. Reinstall the gas valve
cap and guard.
Procedure I - Swing Valve Work Port Reliefs
Pressure
1. Install pressure check diagnostic quick disconnect with
gauge onto test nipple at swing valve inlet test port
Figure 2-12.
2. With the swing brake ON and the engine running at full
rpm, swing left and adjust “A” port swing relief to
2200 psi ±50 (15.2 MPa ±0.4).
3. With the swing brake ON and the engine running at full
rpm, swing right and adjust “B” port swing relief to
2200 psi ±50 (15.2 MPa ±0.4).
Item Description
1 Gas Valve Guard
2 Gas Valve
3 Accumulator
4 Gauge
5 Gas Chuck
6 Bleed Valve
FIGURE 2-11
1
2
4
6
5
6659-6
3
Reference Only