HYDRAULIC SYSTEM GRT9165 SERVICE MANUAL
2-64
Published 10-01-2020 Control # 699-00
onto test the nipple at port 4 of the Accessory manifold
(Figure 2-27).
2. Make sure that the counterweight is not attached to the
cylinders and the superstructure is in a position that the
cylinders can be fully actuated in both directions.
Counterweight Lower
1. Start engine and idle. Activate the counterweight lower
function (see Operator Manual) 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, 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 Manitowoc Crane Tool, open Tools > EEprom
> View Parameters > Super > Counterweight >
Lower 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, contact your Grove Crane
distributor or Manitowoc Crane Care.
d. After the pressure is achieved, make sure to “Save
active to customer” and “Save active to factory.”
Counterweight Raise
1. Start engine and idle. Activate the counterweight raise
function (see Operator Manual) 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, use the service tool as
follows to adjust:
a. In the Manitowoc Crane Tool, open Tools > EEprom
> View Parameters > Super > Counterweight >
Raise 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.
b. After the pressure is achieved make sure to “Save
active to customer” and “Save active to factory.”
2. Stop the engine.
Counterweight Pin
1. Start engine and idle. Active the counterweight pin
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, use the service tool as follows to adjust:
2. In the Manitowoc Crane Tool, open Tools > EEprom >
View Parameters > Super > Counterweight > Pin
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 to be adjusted by more than 100 mA,
contact your Grove Crane distributor or Manitowoc
Crane Care.
3. After the pressure is achieved make sure to “Save active
to customer” and “Save active to factory.”
4. Stop the engine.
Hydraulic Boom Extension
1. Start the engine and idle. Activate the hydraulic boom
extension function until end stroke of the cylinder is
achieved in either direction and hold. If the boom
extension cylinder is not installed, plug the hoses
instead. 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, use the service tool as follows to adjust:
a. In the Manitowoc Crane Tool, open Tools > EEprom
> View Parameters > Super > Counterweight > Jib
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.
b. After the pressure is achieved make sure to “Save
active to customer” and “Save active to factory.”
2. Stop the engine.
3. Remove the diagnostic cable.
4. Install the upper electrical cover. For more information,
see Installing the Upper Electrical Cover, page 2-54.
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