Manitowoc Grove GRT8100 Service Manual

2-21
GROVE
GRT8100 SERVICE MANUAL HYDRAULIC SYSTEM
2
Published 3/26/2018, Control # 596-05
1. Ensure reservoir is filled with the proper hydraulic fluid to
the high level mark on the reservoir sight gauge. If
hydraulic oil is aerated (oil has a foamy white tint with
bubbles), allow crane to sit until the air has escaped and
the fluid is a dark solid color.
2. Kawasaki piston pumps only:
a. Remove the plug from the Dr port of the pump. Fill
the pump casing with hydraulic oil, then re-install
plug. Torque plug to 123 lb-ft.
b. Remove the plug from the T port.
Rexroth piston pumps only:
a. Remove the adapter and hose from the T2 port. Fill
the pump casing with hydraulic oil, then re-install
plug. Torque plug to 146 b-ft.
b. Remove the plug from the R port.
3. Remove the breather from the hydraulic oil reservoir,
then install the pump priming tool (Grove part number
80030367) onto the reservoir in place of the breather.
Connect a compressed air supply (nominal 100 psi,
maximum 300 psi) to the pump priming tool.
Wait for a solid stream of fluid, free of air bubbles, to exit
the:
- T port on a Kawasaki pump
- R port on a Rexroth pump
Re-install the plug while oil is flowing out of the port.
Torque plug to the following specification:
- T port plug on Kawasaki pump: 9 lb-ft
- R port plug on Rexroth pump: 146 lb-ft
4. Remove the air supply from the pump priming tool.
5. Remove the pump priming tool and reinstall the
breather.
6. For newly installed piston pumps, check the pressure
settings. Refer to Checking/Setting the Piston Pumps
Cut-off and Differential Pressures, page 2-24.
Priming/Starting-Up the Hydraulic Gear Pump
1. Ensure reservoir is filled with the proper hydraulic fluid to
the high level mark on the reservoir sight gauge. If
hydraulic oil is aerated (oil has a foamy white tint with
bubbles), allow crane to sit until the air has escaped and
the fluid is a dark solid color.
2. If gear pump is equipped with 7/16-20 UN-2B port in the
inlet side of the pump housing, place an adequate
container under Pump No. 2 to catch the hydraulic oil
and then remove the plug from this port (if the pump has
more than one gear section, remove the plug that is
most convenient as they are common to the inlet).
If gear pump is not equipped with 7/16-20 UN-2B port in
the inlet side of the pump housing, place an adequate
container under Pump No. 2 to catch the hydraulic oil
and then slightly loosen the inlet port hose.
3. Remove the breather from the hydraulic oil reservoir,
then install the pump priming tool (Grove part number
80030367) onto the reservoir in place of the breather.
Connect a compressed air supply (nominal 100 psi,
maximum 300 psi) to the pump priming tool.
4. If gear pump is equipped with 7/16-20 UN-2B port, wait
for a solid stream of fluid, free of air bubbles, to exit the
port, then re-install the plug while oil is still coming out.
Torque plug to 10 lb-ft.
If gear pump is not equipped with 7/16-20 UN-2B port,
wait for a solid stream of fluid, free of air bubbles, to exit
the loose hose connection, then re-tighten the hose
fitting while oil is still coming out. Refer to Hydraulic
Fittings, page 1-12 for proper tightening specification.
5. Perform this step on gear pumps that start up against
high pressure, such as service brake charging or
sequence valve circuits.
a. With the compressed air supply still attached to the
pump priming tool, slightly loosen the outlet port
hose of the pump.
b. Jog the engine starter until a solid stream of fluid,
free of air bubbles, exits the loose hose connection,
CAUTION
The Pump Priming Tool is set to 1-2 psi to prevent the
reservoir from being over-pressurized and damaged. Do
not adjust the Pump Priming Tool. Always monitor the
pressure gauge of the Pump Priming Tool to ensure that
2 psi is not exceeded during the air bleeding process.
CAUTION
Failure to follow this procedure can cause the pump to
fail.
CAUTION
The Pump Priming Tool is set to 1-2 psi to prevent the
reservoir from being over-pressurized and damaged. Do
not adjust the Pump Priming Tool. Always monitor the
pressure gauge of the Pump Priming Tool to ensure that
2 psi is not exceeded during the air bleeding process.

Manitowoc Grove GRT8100 Specifications

General

Brand	Manitowoc
Model	Grove GRT8100
Category	Construction Equipment
Language	English