12
EATON Hydraulics
70160 Variable Displacement Piston Pump Repair Information E-PUPI-TS005-E June 2004
Model 70160
18
Lubricate and install the
thrustplate over the input shaft
assembly and into the camplate.
The thrustplate must rest firmly in
its pocket located in the camplate.
19
Reassemble the rotating kit
assembly by first aligning the
splines in the pivot with the splines
in the block. Install the pivot on the
block assembly pins (see Figure 47).
20
Use a small socket or similar
tool to help retain the pivot in the
centered position. Lubricate and
install the spider and piston
assemblies onto the pivot and
pistons into the piston block
assembly (see Figure 48).
21
Hold the housing assembly in
the vertical position then carefully
install the rotating kit by first
aligning with the splines on the
input shaft. With splines aligned,
install the rotating kit into the
pump housing (see Figure 50). Use
caution to ensure all parts are kept
in their proper position.
22
With the rotating kit installed,
reposition the housing assembly in
the input shaft down position and
install a new housing gasket (see
Figure 50).
23
Lightly coat the backplate side
of the valve plate with petroleum
jelly for retention during assembly.
Install the valve plate over the
needle bearing, aligning the small
slot on the outside of the valve
plate with the dowel pin in the
backplate (see Figure 51).
24
Carefully install the backplate
assembly by aligning it with the
dowel pins located in the pump
housing. Use caution not to
dislodge the valve plate (see Figure 54).
25
Align the spline of the
gerotor’s inner ring, then lubricate
and install the inner ring and outer
ring over the input shaft and onto
the backplate assembly (see Figure
53).
Note: Before installing the charge pump adaptor plate, offset
the outer ring of the geroter as
shown.
26
With the gerotor assembly
installed, install new o-ring into
charge pump adapter plate and
place adapter onto backplate over
gerotor. Retain with cap screws.
Torque cap screws to 25 N•m [18.5
lbf•ft] (see Figure 54).
27
Install the two high pressure
relief valves. Torque valves 128,8
to 142,4 Nm [95 to105 lb-ft] (see
Figure 55).
29
Lubricate and reassemble the
bypass valve assembly. Install the
bypass valve into the backplate.
Torque valve to 30,5
±
2 Nm
[22.5
±
1.5 lb-ft] (see Figure 56).
30
Coat the charge pressure
poppet with petroleum jelly and
place poppet onto spring and install
into the adapter plate (see Figure
57).
31
Install the hollow charge
pressure relief valve retainer into
the adapter plate. Torque retainer
to 6,8 to 9,5 Nm [5 to 7 lb-ft].
32
Lubricate and install the o-ring
on the cover plate or gear pump.
Install the cover plate or gear pump
and two cap screws. Torque cap screws to 36,6 to 40 Nm [27
to 31 lb-ft].
The Model 70160 or 78162 variable displacement pump is now
ready for test and reinstallation.
Figure 48
Figure 49
Figure 51
Figure 54
Figure 55
Figure 56
Figure 57
Repair Information
- Reassembly
Figure 47
Figure 50
Figure 52
Figure 53
