Manitowoc Grove GRT9165, Руководство по обслуживанию

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HYDRAULIC SYSTEM GRT9165 SERVICE MANUAL
2-62 Published 10-01-2020 Control # 699-00
NOTE: This accumulator charge valve is non-adjustable.
1. With engine off, depress the service break pedal 12 to
15 times to discharge all the pressurized fluid stored in
the accumulators.
2. Install pressure check diagnostic quick disconnect (such
as Parker PD240) with gauge onto test nipple at the
brake accumulators (1, Figure 2-31).
3. Start the engine and idle. The charging valve will
immediately start to charge the accumulators. Watch the
pressure gauge, the high charge limit should read the
value cited in Table 2-3 (when the pressure will stop
rising).
NOTE: This accumulator charge valve is non-adjustable. If
the pressure is less than specified value and the
valve does not stop charging, turn the accessory
manifold pressure reducing valve in a half turn at a
time (4, Figure 2-27) and repeat step 3. It may
require adjusting the accessory manifold pressure
reducing valve by a half turn several times before
the pressure is set high enough to allow the brake
valve to fully charge.
4. With the engine still at idle, repeatedly depress the
service brake pedal on the cab floor until the gauge
pressure reads approximately 2600 PSI (179 bar). After
the pressure is reached, push the brake pedal again to
start the recharge cycle (this could take two pedal
applications). Watch the gauge and verify the low
charging limit is the value cited in Table 2-3 (when it
starts to recharge).
5. Stop the engine. Remove the pressure gauge.
Service Brake Accumulators Pre-charge
Use the following procedure to pre-charge the service brake
accumulators.
1. With the engine off, depress the service brake pedal four
to six times to discharge all of the pressurized oil stored
in the accumulators. Remove the gas valve guard and
cap on the accumulator (Figure 2-31).
2. Before attaching the gas charging assembly
(Figure 2-31) onto the gas valve, back the gas chuck “T”
handle counterclockwise.
3. Close the charging assembly bleed valve. Attach the
swivel nut onto the gas valve and tighten (10-15 lbs/
inch).
4. Turn the gas chuck “T” handle clockwise, which will
depress the core in the gas valve.
5. Check the pre-charge pressure. The readings of the
following gauges should read the value of cited in
Table 2-3:
a. Service brake accumulator pre-charge, rear
b. Service brake accumulator pre-charge, front
c. Suspension accumulator pre-charge
6. If the pressure meets the above pressures, remove the
charging valve assembly by turning the “T” handle all the
way out on the gas chuck, and then open the bleed valve
and proceed to step 7 (Figure 2-32). If the pressure is
low see pre-charging procedure below.
7. Secure the gas valve, loosen the swivel nut and remove
the charging assembly (Figure 2-32). Replace the gas
valve cap (2) and guard (1).
FIGURE 2-31
1
Brake Pressure Port Location
1 Brake Pressure Port
10141
FIGURE 2-32
1
2
Accumulator Charging
1 Gas Valve Guard
2 Gas Valve
Charging Assembly
10142