Manitowoc Grove RT770E, Service Maintenance Manual

Page: 57 / 357

2-17
GROVE
RT770E HYDRAULIC SYSTEM
2
Published 11/26/2014, Control # 447-05
HYDRAULIC PUMPS
Description
The No. 1 and No. 3 hydraulic pumps Figure 2-4 are
mounted on a drive pad of the torque converter. The No. 2
hydraulic pump Figure 2-4 is mounted on a drive pad of the
engine. The torque converter drives the No. 1 and No. 3
pumps. The engine directly drives the No. 2 pump.
The purpose of these pumps is to convert the mechanical
energy of the engine and the torque converter into fluid
e ne r g y fo r t h e o p e r a ti o n of t he c r a ne ’s h yd r au l i c
components.
Pump No. 1
NOTE: Pump output figures are theoretical.
The No. 1 hydraulic pump is a positive displacement, gear-
type pump that has two separate sections.
The first section of the pump, the one closest to the mounting
face, is a 81.1 cm
3
(4.95 in
3
) section with an output of
190.8 L/min (50.4 gpm) at 2451 rpm (loaded). The second
section is a 40.3 cm
3
(2.46 in
3
) section with an output of
95.0 L/min (25.1 gpm) at 2451 rpm (loaded).
Pump No. 2
The No. 2 hydraulic pump is a positive displacement, gear-
type pump with a 43.9 cm
3
(2.68 in
3
) section, and an output
of 105.2 L/min (27.8 gpm) at 2500 rpm (loaded).
Pump No. 3
The No. 3 hydraulic pump is a positive displacement, gear-
type pump with a 38.0 cm
3
(2.32 in
3
) section with an output
of 74.9 L/min (19.8 gpm) at 2451 rpm (loaded).
Maintenance
No. 1 Pump Removal
1. Gain access to the pump. It is bolted to the right side of
the engine’s torque converter.
2. Tag and disconnect the supply line from the pump. Cap
or plug the line and port.
3. Tag and disconnect the pump distribution lines from the
pump. Cap or plug the lines and ports.
4. Remove the capscrews and washers attaching the No. 1
pump to the drive pad on the torque converter. Remove
the pump.
5. Clean the gasket material from the drive pad on the
torque converter and the pump.
6. Cover the drive pad’s opening to prevent dirt from
entering.
No. 1 Pump Installation
1. Clean the drive pad and the pump with Loctite cleaning
solvent 7070 or similar non chlorinated solvent.
2. Apply a light coating of Loctite primer N7649 to drive pad
and pump mounting surface. Allow primer to dry for one
to two minutes. Primer must be dry. Mating of parts
should occur within five minutes.
3. Apply gasket material Loctite Master Gasket 518 to drive
pad and pump mounting surface.
4. Install pump and gasket on torque converter drive pad
with capscrews and washers. Make sure the splines
mesh properly. Torque capscrews; refer to
Fasteners
and Torque Values , page 1-16 for proper torque value.
5. Connect the distribution and supply lines to the pump as
tagged during removal. For the two distribution lines,
install new O-rings with the flange halves and
capscrews.
No. 1 Pump and Pump Disconnect Assembly
Removal (Optional)
1. Gain access to the pump. It is bolted to the right side of
the engine’s torque converter.
2. Tag and disconnect the supply line from the pump. Cap
or plug the line and port.
3. Tag and disconnect the pump distribution lines from the
pump. Cap or plug the lines and ports.
4. Pull handle to disengage the splined coupler from the
drive pad.
CAUTION
Absolute cleanliness is essential when working on the
hydraulic pumps. Always work in a clean area. The
presence of dirt and foreign materials in the system can
result in serious damage or inadequate operation.
CAUTION
Keep the pump as level as possible to avoid damaging
the input spline.
CAUTION
Absolute cleanliness is essential when working on the
hydraulic pumps. Always work in a clean area. The
presence of dirt and foreign materials in the system can
result in serious damage or inadequate operation.