Manitowoc Grove GRT9165 Service Manual

2-63
GROVE
GRT9165 SERVICE MANUAL HYDRAULIC SYSTEM
2
Published 10-01-2020 Control # 699-00
Checking the Service Brake Accumulator Pre-charge
Use the following procedure to check the service brake
accumulator pre-charge.
1. With the engine off, depress the service brake pedal on
the cab floor 10 to12 times to discharge all of the
pressurized oil stored in the accumulators. Remove the
gas valve guard and cap on the accumulator
(Figure 2-32).
2. Ensure that the nitrogen supply bottle is shut off, then
attach the charging valve assembly to it.
3. Before attaching the charging assembly to the
accumulator gas valve, fully back out the gas chuck “T”
handle (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 (10 – 15 lbs/inch).
5. Turn the gas chuck “T” handle all the way down
(clockwise), which will depress the core in the gas valve.
6. Slowly open the nitrogen bottle valve and fill the
accumulator. Close the valve when the readings of the
following gauges 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
7. If the pre-charge is higher than specified in Table 2-3,
close the nitrogen bottle and slowly open the bleed valve
on the charging assembly (Figure 2-32) until the
pressure is to specification.
8. Remove the charging valve assembly (turn
counterclockwise), and then open the bleed valve.
9. Secure the gas valve, loosen the swivel nut and remove
the charging assembly. Replace the gas valve cap and
guard.
Checking/Setting Cab Tilt Raise and Lower
Pressures
Use the following procedure to check and set the raise and
lower pressures for the cab tilt cylinder.
NOTE: This procedure assumes use of Manitowoc Crane
Service Tool.
1. With the engine off, install pressure check diagnostic
quick disconnect (such as Parker PD240) with gauge
onto test the nipple at port 4 of the Accessory manifold
(6, Figure 2-27).
Cab Tilt Lower
2. Start engine and idle. Activate the cab lower function
until full stroke of the cylinder is achieved and hold.
Slowly accelerate the engine to full RPM. The reading at
port 4 should read the value cited in Table 2-3. If it is not
in the value range, use the service tool to adjust.
a. Remove the upper electrical panel to access the
diagnostic connector.
b. Connect the Manitowoc Crane Tool to the diagnostic
connector.
c. In the Manitowoc Crane Tool, open Tools > EEprom
> View Parameters > Super > Cab Tilt > Tilt Down
Pressure. In the params row, increase the value to
increase the pressure or decrease the value to
decrease the pressure (adjustment by 10 mA
increments is suggested). Make sure to write
column to “active settings”. Repeat this step until the
pressure is achieved. If the value needs adjusted by
more than 100 mA there may other issues in the
circuit.
d. After the pressure is achieved make sure to “Save
active to customer” and “Save active to factory”.
Cab Tilt Raise
1. Start engine and idle. Activate the cab raise function until
full stroke of the cylinder is achieved and hold. Slowly
accelerate the engine to full RPM. The reading at port 4
should read the value cited in Table 2-3. If it is not within
the range, use the service tool as follows to adjust:
a. Remove the upper electrical panel to access the
diagnostic connector.
b. Connect the Manitowoc Crane Tool to the diagnostic
connector.
c. In the In the Manitowoc Crane Tool, open Tools >
EEprom > View Parameters > Super > Cab Tilt > Tilt
Up Pressure. In the params row, increase the value
to increase the pressure or decrease the value to
decrease the pressure (adjustment by 10 mA
increments is suggested). Make sure to write
column to “active settings.” Repeat this step until the
pressure is achieved. If the value needs adjusted by
more than 100 mA there may other issues in the
circuit.
d. After the pressure is achieved, make sure to “Save
active to customer” and “Save active to factory.”
2. Stop the engine. Remove diagnostic couplers.
Checking/Setting Counterweight and
Hydraulic Boom Extension Pressures
1. With the engine off, install pressure check diagnostic
quick disconnect (such as Parker PD240) with gauge

Manitowoc Grove GRT9165 Specifications

General

Brand	Manitowoc
Model	Grove GRT9165
Category	Construction Equipment
Language	English