Eaton 70360 Owner's manual

Eaton®
Medium Duty Piston Pump
Model 70360 Variable Displacement Piston Pump
40,6 cm3/r [2.48 in3/r] or 49,2 cm3/r [3.00 in3/r] Displacements
Manual Controlled
Parts and Repair
Information
No. 6-637
January 1998

2
Model 70360
Table of Contents
Introduction .........................................................................................................2
Identification........................................................................................................3
Tools Required ....................................................................................................3
Parts Drawing ......................................................................................................4 - 5
Parts List .............................................................................................................6 - 14
Main Parts List ..............................................................................................6 - 7
Rotating Kit Assembly ...................................................................................8
Cap Screw Locations .....................................................................................8
Relief Valve....................................................................................................9
Backplate Assembly Identification .................................................................10 - 11
Charge Pump Adapter Identification ..............................................................12 - 13
Drive Shaft Identification ...............................................................................14
Repair information...............................................................................................15 - 19
Disassembly ..................................................................................................15 - 17
Reassembly ...................................................................................................18 - 19
Fault - Logic Troubleshooting ..............................................................................20 - 24
Start-up Procedure ..............................................................................................25
Introduction
This manual provides service information for Eaton Models 70360 variable displacement piston pumps. Step
by step instructions for the complete disassembly, inspection, and reassembly of the pump are given. The
following recommendations should be followed to insure successful repairs.
Remove the pump from the application.
Cleanliness is extremely important.
Clean the port areas thoroughly before disconnecting the hydraulic lines.
Plug the pump ports and cover the open hydraulic lines immediately after they're disconnected.
Drain the oil and clean the exterior of the pump before making repairs.
Wash all metal parts in clean solvent.
Use compressed air to dry the parts. Do not wipe them dry with paper towels or cloth.
Compressed air should be filtered and moisture free.
Always use new seals when reassembling hydraulic pumps.
Lubricate the new rubber seals with a petroleum jelly (Vaseline®) before installation.
Torque all bolts over gasketed joints, then repeat the torquing sequence to makeup for gasket
compression.
Verifying the accuracy of pump repairs on an authorized test stand is essential.
Introduction

3
Model 70360
Serial Number Code:
A 96 01 31 JB Tester's Initials
Day of Month (two digits)
Month (two digits)
Revision level of parts list.
Last two digits of year built.
( 91 for 1991 etc.)
Identification Numbers - Manually Variable Displacement Piston Pump
Stamped on each unit's mounting flange.
A - Product Number Description
70360 = Single Piston Pump
78362 = Single Piston Pump with Gear Pump
78361 = Tandem Piston Pumps
78363 = Tandem Piston Pumps with Gear Pump
B - Sequential Numbering
Single Pump - Product Number:
7 0 3 6 0 - R A A
Tandem Pumps - Product Number:
7 8 3 6 3 - R A B
A
A
B
B
Tools Required
9/16, 7/8, 1-1/8 in. sockets and/or end
wrenches
Torque wrench (203 N.m [150 lbf.ft] capacity)
Ratchet wrench
7/16 in. Allen wrench or bit socket
Internal and external retaining ring pliers
Small screwdrivers (2)
Hammer (soft face)
Light Petroleum Jelly
Seal driver or similar tool
Each order must include the following information.
1. Product and/or Part Number
2. Serial Number Code
3. Part Name
4. Quantity

4
Model 70360
Parts
Drawing
Pump drawn below is typical of a righthand rotation pump.
24-1
28
14
3
12
14
10-1
12-1
10-2
10
6
6
11
11
9
44
20 41 516 17 16 5
4
27
Shaft assembly for
rear pump of tandem.
27
32
24
54
54-1
53
Port
(D2)
Port
(D2)
53-1
20 516 17
4
16 5
Shaft assembly for
single pump
or front pump
of tandem.

5
Model 70360
Parts
Drawing
Note "V" notch
locations
Lefthand
Rotation
Righthand
Rotation
Valve Plate
Identification
25-1
Used in place of Auxiliary pump.
Refer to Backplate
Assembly Identification section
for additional backplates.
K2-1
K2-2
K2-3
K1-1 K1-2
K1-3
(K3-2)
(K3-1)
(K3-3)
Port (A)
Port
(C1)
Port
(C1)
Port (S)
Port (C2)
Port (B)
Port (A)
Port (B)
26
25-2
15
2
25
25-3-3
25-3b
22
7
8-1
8
23
78-1 8
38
30
31
39
29
18
19
61
40
25-3
45
29-1
33
36 43
K3
K2
37-1
37
25-1
25-2
26
15
2
25
22
7
8-1
8
23
78-1 8
18
25-3
25-3-3
25-3-3
25-3a
19
K1
Assembly for unit without
gerotor charge pump.
Assembly for single pump
or rear pump of tandem.
25-3-3

6
Model 70360
Parts List
Item Part No. Qty. Description
2 16028-404 2 Dowel Pin
3 16322-xxx A/R Shims
+ 4 16077-32 1 Retaining Ring
+ 5 16078-18 2 Retaining Ring
6 16032-610 6 Screw
7 17079-2 2 Spring
8 32060-8 2 Plug Assembly
+ 8-1 16015-18-90 2 O-ring, 2,38 mm Dia. x 22,23 mm I.D. [.0937 in. Dia. x .875 in. I.D.]
9♦1 Rotating Kit Assembly (parts list on page #8)
10 70360-508 1 Cover Plate SA
+ 10-1 16003-40 1 O-ring, 4,76 mm Dia. x 85,73 mm I.D. [.1875 in. Dia. x 3.375 in. I.D.]
10-2 16253-16 1 Seal, Trunnion Shaft
11 16048-113 6 Washer
12 70360-507 1 Cover Plate SA
+ 12-1 16003-40 1 O-ring, 4,76 mm Dia. x 85,73 mm I.D. [.1875 in. Dia. x 3.375 in. I.D.]
14 16320-122 2 Bearing Cone
+ 15 70412-626 1 Housing Gasket
16 74308-100 2 Thrust Race
17 74308-101 1 Needle Thrust Bearing
18 ♦2 Cap Screws (Locations on page #8)
16032-622 3/8-16, 57,2 mm [2.25 in.] Long
16040-640 3/8-16,101,6 mm [4.0 in.] Long
19 ♦2 Cap Screws (Locations on page #8)
16032-616 3/8-16, 38,1 mm [1.5 in.] Long
16032-620 3/8-16, 50,8 mm [2.0 in.] Long
16032-632 3/8-16, 82,6 mm [3.25 in.] Long
+ 20 16253-18 1 Shaft Seal, Drive
20 16253-218 1 Shaft Seal, Drive (fluorocarbon rubber)
20 70400-620 1 Spacer (Used in rear pump of tandem in place of drive shaft seal.)
22 ♦1 Relief Valve for Port "A" (Identification drawing on page #9)
23 ♦1 Relief Valve for Port "B" (Identification drawing on page #9)
24 1 Housing Assembly
70360-302 1 with drain port D1 and D2
70360-309 1 with drain port D1, D2, and D3
24-1 16238-11816 1 Bearing (press fit)
25 ♦1 Backplate Assembly (Identification drawing and parts list on page #10 & #11)
26 1 Valve Plate (Identification drawing on page #5)
70344-51 Righthand (CW) Rotation
70344-52 Lefthand (CCW) Rotation
27 ♦1 Drive Shaft (Identification drawing on page #14)
28 ♦1 Camplate
70360-606 1 Square End Trunnion
29 ♦1 Charge Pump Adaptor (Identification drawing and parts list on page #12 & #13)
30 1 Inner Gerotor
79004-611 6,9 cm3/r [.42 in3/r] displacement, 6,35 mm [.25 in ] width
79004-605 13,8 cm3/r [.84 in3/r] displacement, 12,7 mm [.5 in] width
31 1 Outer Gerotor
79004-612 6,9 cm3/r [.42 in3/r] displacement, 6,35 mm [.25 in ] width
79004-606 13,8 cm3/r [.84 in3/r] displacement, 12,7 mm [.5 in] width
32 1 Key, Drive Shaft
16246-516 Used with 25,4 mm[1.00 in] dia. drive shaft.
24500-619 Used with 22,2 mm [.875 in] dia. drive shaft.
33 16007-14 1 O-ring (In K2 & K3 kit)
34 70411-613 1 Coupler
35 70411-605 1 Mounting Bracket

7
Model 70360
Parts List
36 70142-600 1 Cover Plate (In K3 kit)
37 16103-108 1 Plug Assembly
+ 37-1 16133-8 1 O-ring, 2,21 mm Dia. x 16,36 mm ID. [.087 in. Dia. x .644 in. ID.]
38 15222-20 1 Key, Gerotor Pump Adapter
+ 39 70342-600 1 Molded O-ring
40 16048-113 2 Washer
41 16048-319 1 Washer
42 16246-523 1 Key, Camplate Trunnion
43 16032-610 2 Cap Screws, Cover Plate (In K3 kit)
44 70300-604 1 Insert, Camplate
45 16048-113 6 Washer
53 16103-308 1 Plug Assembly
+ 53-1 16133-8 1 O-ring, 2,20 mm Dia. x 16,35 mm ID. [.087 in. Dia. x .644 in. ID.]
54 16103-308 1 Plug Assembly
+ 54-1 16133-8 1 O-ring, 2,20 mm Dia. x 16,35 mm ID. [.087 in. Dia. x .644 in. ID.]
Mounting Kits
K1 70342-905 1 Tandem Piston Pump Mounting Kit
K1-1 70411-622 1 41T Coupler, 33,02 mm [1.3 in.] long
K1-2 16007-17 1 O-ring, 1,59 mm Dia. x 101,6 mm ID. [.0625 in. Dia. x 4 in. ID.]
K1-3 16032-812 2 Cap Screws
K2 70442-929 1 Gear Pump Mounting Kit
K2-1 16007-14 1 O-ring, 1,59 mm Dia. x 82,55 mm ID. [.0625 in. Dia. x 3.25 in. ID.]
K2-2 16048-113 1 Washer
K2-3 16032-610 2 Cap Screws
K3 70142-915 1 Cover Plate Kit
K3-1 16007-14 1 O-ring, 1,59 mm Dia. x 82,55 mm ID. [.0625 in. Dia. x 3.25 in. ID.]
K3-2 70142-600 1 Cover Plate
K3-3 16032-610 2 Cap Screws
Seal Repair Kits
• 70360-900 1 Seal Repair Kit for 70360 piston pump. (Order two for tandem pumps)
Legend ♦Refer to specific item parts list.
+ Common parts to seal repair kits.

8
Model 70360
Item 9 - Rotating Kit Assembly
Item 18 and 19 - Cap Screw Locations
16032-622
16032-640
16032-622
16032-632 16032-620
Rear "B" Flange,
without Gerotor,
Opposite Side Porting
Rear "A" Flange,
without Gerotor,
Same Side Porting
Rear "A" Flange,
with Gerotor,
Opposite Side Porting
16032-622
16032-616
Rear "A" Flange,
without Gerotor,
Opposite Side Porting
Item 18 and 19
Cap Screw Locations
Item Part No. Qty. Description
970300-603 1 Rotating Kit Assy. 2.48 in3/r
70400-703 1 Rotating Kit Assy. 3.00 in3/r
9-1NSS 9 Piston Assembly
9-2NSS 1 Spider
9-3NSS 1 Spider Pivot
9-4NSS 1 Retainer
9-5NSS 1 Piston Block
9-6NSS 3 Pins
9-7NSS 2 Washer
9-8NSS 1 Spring
9-9NSS 1 Retaining Ring
NSS - Not Sold Separately
Item 9
Rotating Kit Assembly
9-1
9-2 9-3
9-5
9-4
9-6 9-7 9-8
9-9
9-7
9

9
Model 70360
Item 22 or 23 - Relief Valve
Item 22 or 23
Internal Relief Valve Settings Available
Part Number bar [PSI]
32060-LA 138 [2000]
32060-QA 172 [2500]
32060-UA 207 [3000]
32060-WA 241 [3500]
32060-ZA 276 [4000]
32060-XA 310 [4500]
32060-IA 345 [5000]
70111-518 Seat, Valve
32060-LA
2000
Assembly Number
and Pressure Setting

10
Model 70360
Assembly Aux. Port C1 Aux. Port C3 Aux. Port C1 Aux. Port C3 Aux. Port C4 Aux. Port
Description Part Number Machined Plug Plug Bypass Valve Bypass Valve Plug
25(a) - Accepts
Gerotor Charge
Pump 70300-413 C1 Item 25-3a
70300-426 C1 Item 25-3
25(b) - Rear "A" Mount,
Opposite
Side Porting 70300-409 C1
70300-415 C1, C3 Item 25-3
25(c) - Rear "A" Mount,
Same Side
Porting 70300-403 C1, C3 Item 25-3a
70300-421 C1, C3 Item 25-3b
70300-437 C1, C3 Item 25-3b
25(d) - Rear "B" Mount, Opposite Side Porting
Horizontal 70300-407 C1
70300-411 C1, C4 Item 25-3
70300-439 C1, C4 Item 25-3a
Vertical 70360-413 C1, C4 Item 25-3a
25(e) - Rear "B" Mount, Same Side Porting
Horizontal 70300-401 C1, C4 Item 25-3a
70300-418 C1, C4 Item 25-3a
Vertical 70360-411 C1, C4 Item 25-3a
Item 25 -
Backplate Assembly Identification
Item 25 - Parts List (Refer to Identification chart and drawings)
Item Part No. Qty. Description
25 See Chart Below Backplate Assembly
25-152200-23 1 Bearing
25-216026-610 1 Dowel Pin
25-370300-610 1 Bypass Valve Assembly
+ 25-3-116078-6 1 Retaining Ring
25-3-270300-609 1 Separator Plug
+ 25-3-316133-8 1 O-ring, 2,38 mm Dia. x 16,27 mm I.D. [.0937 in. Dia. x .6406 in. I.D. ]
25-3-470411-502 1 Speader
+ 25-3-516003-7 1 O-ring, 1,59 mm Dia. x 9,53 mm I.D. [.0625 in. Dia. x .375 in. I.D.
25-3a 16103-108 1 Plug Assembly, Hex
+ 25-3-316133-8 1 O-ring, 2,38 mm Dia. x 16,27 mm I.D. [.0937 in. Dia. x .6406 in. I.D. ]
25-3b 16103-308 1 Plug Assembly, Internal Hex Socket
+ 25-3-316133-8 1 O-ring, 2,38 mm Dia. x 16,27 mm I.D. [.0937 in. Dia. x .6406 in. I.D. ]
Legend + Common parts to seal repair kits listed.
Item 25
Backplate Assembly Identification (Refer to drawings on page #11)

11
Model 70360
Item 25 -
Backplate Assembly Identification
25-1
25-2
Port
(C4)
25(d)
Rear "B" Mount
(Horizontal), Opposite
Side Porting
Port
(C1)
25-3
Port
(C1)
25-1
25-2
Port
(C3)
25-3a
25-3b
25(b)
Rear "A" Mount,
Opposite
Side Porting
Port
(C3)
Port
(C1)
25-1
25-2
25-3
25-3a
25-3b
25-3
25-3a
25-3b
25-3a
25-3b
25-1
25-2
25-3a
Port
(C4)
25-3
Port
(C1)
25-3a
25-3b
25-3b
25(e)
Rear "B" Mount
(Horizontal), Same
Side Porting
25(a)
Accepts
Gerotor Charge
Pump Adapter
25(c)
Rear "A" Mount,
Same Side
Porting
25-3-3
25-3b
25-3
25-3-1
25-3-2
25-3-3
25-3-4
25-3-5
25-1
25-2
Port
(C1)
25-3a
25-1
25-2
Port
(C4)
Pressure
Port (A)
Pressure
Port (B)
25(d)
Rear "B" Mount
(Vertical), Opposite
Side Porting
Port
(C1)
25-3
25-3a
25-3b
25-3a
25-3b
25-1
25-2
Port
(C4)
Pressure
Port (A)
Pressure
Port (B)
25(e)
Rear "B" Mount
(Vertical), Same
Side Porting
Port
(C1)
25-3
25-3a
25-3b
25-3a
25-3b

12
Model 70360
Item 29 -
Charge Pump Adapter Assembly Identification
Gerotor Pocket Depth
Displacement Depth of Pocket
cm3/r [in3/r] mm [in.]
6,9 [.42] 6,35 [.25]
13,8 [.84] 12,7 [.50]
Righthand Rotation
Lefthand Rotation
29-4
29-3 29-1
29-2
Gerotor Ring
Pocket
(See chart for
depth)
Bearing
29-4a
29-3a or 3b
29-2a
Configuration for
6,9 to 10,3 bar
[100 to 150 PSI]
Charge Relief Valve
29
Configuration for
13,8 to 17,2 bar [200 to 250 PSI] or
17,2 to 20,7 bar [250 to 300 PSI]
Charge Relief Valve
Charge Pump
Suction Port
Pressure Check Port or
Remote Charge Port
29-4
29-3
29-2
Configuration for
6,9 to 10,3 bar
[100 to 150 PSI]
Charge Relief Valve
29-4a
29-3a or 3b
29-2a
Pressure Check Port or
Remote Charge Port
Gerotor Ring
Pocket
(See chart for
depth)
Charge Pump
Suction Port
29-1
Bearing
Configuration for
13,8 to 17,2 bar [200 to 250 PSI] o
r
17,2 to 20,7 bar [250 to 300 PSI]
Charge Relief Valve
29

13
Model 70360
Item 29 -
Charge Pump Adapter Assembly
No Charge Relief
Item Part No. Qty. Description Rotation Displacement
29 70440-369 1 Assembly, Charge Pump Adapter Righthand 13,8 cm3/r [.84 in3/r]
29-116239-1148 1 Bearing (press fit)
6.9 to 10.3 bar [100 to 150 PSI] Charge Relief Setting
Item Part No. Qty. Description Rotation Displacement
29 70442-356 1 Assembly, Charge Pump Adapter Righthand 6,88 cm3/r [.42 in3/r]
70442-368 1 Assembly, Charge Pump Adapter Lefthand 13,8 cm3/r [.84 in3/r]
70442-374 1 Assembly, Charge Pump Adapter Righthand 13,8 cm3/r [.84 in3/r]
70442-389 1 Assembly, Charge Pump Adapter Lefthand 6,88 cm3/r [.42 in3/r]
29-116239-1148 1 Bearing (press fit)
29-270111-507 1 Poppet, Cup
29-317000-48B 1 Spring, Tapered
29-470400-505 1 Spring Retainer
13.8 to 17.2 bar [200 to 250 PSI] Charge Relief Setting
Item Part No. Qty. Description Rotation Displacement
29 70440-388 1 Assembly, Charge Pump Adapter Lefthand 6,88 cm3/r [.42 in3/r]
70440-389 1 Assembly, Charge Pump Adapter Righthand 6,88 cm3/r [.42 in3/r]
70440-385 1 Assembly, Charge Pump Adapter Righthand 13,8 cm3/r [.84 in3/r]
29-116239-1148 1 Bearing (press fit)
29-2a 70400-727 1 Poppet, Pin
29-3a 17056-40 1 Spring, Color "Light Green"
29-4a 70400-512 1 Spring Retainer
17.2 to 20.7 bar [250 to 300 PSI] Charge Relief Setting
Item Part No. Qty. Description Rotation Displacement
29 70440-381 1 Assembly, Charge Pump Adapter Righthand 6,88 cm3/r [.42 in3/r]
70440-390 1 Assembly, Charge Pump Adapter Righthand 13,8 cm3/r [.84 in3/r]
29-116239-1148 1 Bearing (press fit)
29-2a 70400-727 1 Poppet, Pin
29-3b 17056-41 1 Spring, Color "Pink"
29-4a 70400-512 1 Spring Retainer

14
Model 70360
Item 27 - Drive Shaft Identification
Part Number Input Drive Where Used Output Drive
Tandem Front Pump
Tandem Rear Pump
Tandem Rear Pump
Single Pump
Single Pump
Single Pump
9 Tooth
Internal
41 Tooth
9 Tooth
Internal
9 Tooth
Internal
9 Tooth
Internal
9 Tooth
Internal
70442-228 [15 Tooth]
70442-299 [41 Tooth]
70442-229 [41 Tooth]
70442-202 [15 Tooth]
or 70442-209 [13 Tooth]
70442-248 [15 Tooth]
or 70442-297 [13 Tooth]
70442-275 [1 in. Keyed]
or 70440-200 [7/8 in. Keyed]
Tandem Middle Pump
41 Tooth
70440-203 [41 Tooth]
Single Pump
70440-206 [Tapered]
9 Tooth
Internal
Tandem Front Pump
70442-232 [Tapered]
41 Tooth

15
Model 70360
Disassembly
The following disassembly
procedure applies to a single pump
with or without gear pump The
repair procedure for tandem
pumps, once they are separated, is
basically the same. The basic
configuration differences between a
single and tandem pumps are the
backplates, pump shafts and
housing assemblies. In most
cases, only the rear pump of tandem units contain a charge
pump, which is common to both the front and rear pump. The
rear tandem pump does not incorporate a shaft seal.
Thoroughly clean the Eaton Model 70360 or 78362 variable
displacement pump before any
repairs are attempted. When
working on tandem pumps,
separate the front and rear pumps
first.
1Support the pump with the
input shaft down. Use a 9/16 in.
socket or end wrench to remove
the pump adapter cover plate or
gear pump. (See Figure 2)
2Use a pick or similar tool to
remove the adapter cover plate or
gear pump o-ring. (See Figure 3)
3Use a 7/16 in. Allen wrench or
bit socket remover to remove the
charge pressure relief valve spring
retainer from the pump adaptor
assembly. (See Figure 4)
4Use a pencil magnet or similar
tool to carefully remove the charge
pressure spring and poppet from
the pump adaptor assembly. (See
Figure 5) Use caution not to drop
the charge pump poppet into the
pump adaptor assembly.
5The charge pressure relief
valve and poppet may be of the
standard or high pressure type. The
(6.9 to 10.3 bar [100 to 150 PSI])
standard spring and poppet are
shown on the bottom and the
optional high pressure (13.7 to
20.7 bar [200 to 300 PSI]) spring
and poppet is shown on the top.
The same charge pressure relief valve spring retainer is used
with either the standard or high
pressure.(See Figure 6)
6Use a 7/8 in. socket or end
wrench to remove the optional
bypass valve assembly from the
backplate. (See Figure 7)
7The internal seal may be
replaced by first removing the
small retaining ring on the end of
the bypass valve. Remove and
replace the o-rings. (See Figure 8)
8Use a 1-1/16 in. socket or end
wrench to remove the two high
pressure relief valves from the
pumps backplate assembly. (See
Figure 9) Each system relief valve
assembly is identified by both its
part number and relief valve setting
as shown on page 9.
9Firmly support the pump
assembly. Use a 9/16 in. socket or
end wrench to remove the four cap
screws retaining the charge pump
adapter assembly.
10 With the cap screws removed,
remove the charge pump adaptor
assembly from the backplate.(See
Figure 11)
Note: The front pump assemblies
do not have charge pump adapter
assemblies.
11 Turn the adapter assembly
over. Use an o-ring pick or similar
tool remove the o-ring seal. (See
Figure 12)
12 Inspect the gerotor pocket and
needle bearing located in the
charge pump adapter. The needles
in the needle bearing must remain
intact in the bearing cage.
Repair Information
Figure 1
Figure 2
Figure 3
Figure 5
Figure 4
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12

16
Model 70360
13 When the needle bearing
assembly is replaced, the
numbered end of the bearing must
face toward the flange side of the
adapter to the dimension as
shown. (See Figure 13)
14 With the charge pump adapter
removed, remove the charge pump
assemblies outer and inner gerotor
ring. Next, remove the small drive
key from the pump shaft. (See
Figure 14 and 15)
15 Charge pumps are available in
two different displacements Charge
pump displacements are based on
the thickness of the gerotor
assembly and the depth of the pocket located in the charge
pump adapter. To determine the displacement, refer to the
table below.
Gerotor Pocket Depth
Displacement Depth of Pocket
cm3/r [in3/r] mm [in.]
6.9 [.42] 6.35 [.25]
13.8 [.84] 12.7 [.50]
16 To separate the backplate
assembly from the dowel pins in
the pump housing assembly, insert
two screwdrivers between
backplate and housing assembly
and pry upward. (See Figure 16)
17 After separation, remove the
backplate from the housing
assembly.
18 Turn the backplate assembly
over and inspect the needle
bearing. The needles in the needle
bearing must remain intact in the
bearing cage. (See Figure 17)
19 When the needle bearing
assembly is replaced, the
numbered end of the bearing must
face the valve plate side of the
backplate to the dimension as
shown. (See Figure 18)
20 With the backplate removed,
remove the gasket from the pump
housing assembly and discard.
(See Figure 19)
21 Remove the valve plate from the piston block assembly.
Note: This valve plate may have stuck to the backplate
assembly that was just previously removed.
22 Valveplate directional rotation (CW or CCW) is identified
by the location of the metering slots located on the face of the
valve plates. Pump input
rotation should always turn
into the metering slots.
(See Figure 20) A clockwise
valve plate is shown on the
left and a counter clockwise
valveplate is on the right.
Note: Whenever pump input rotation is changed, the valve
plate must be replaced along with the desired rotation charge
pump adapter.
23 Remove the rotating kit assembly by carefully retaining it
in the housing assembly. Lift the housing and rotating kit
assembly and turn over assemblies allowing the rotating kit
assembly to slide down the input shaft and out of the pump
housing.
24 The model 70360 variable
displacement pumps are
available in two different
displacements. The 40,6 cm8/r
~ [2.48 in3/r] rotating kit
assembly is shown below on
the left. The 49,2 cm3/r [3.00 in3/r] rotating kit assembly is
shown below on the right. The 49,2 cm3lr [3 00 in3/r] rotating
assembly is easily identified by having larger pistons and
cutouts in the spider. (See Figure 21)
25 With the rotating kit
assembly removed, remove the
piston assemblies, spider and
spider pivot from the piston
barrel. (See Figure 22)
26 Inspect the piston
assemblies, spider, spider pivot
and piston block. The piston block
assembly usually requires no
further disassembly unless the pins
or block spring are damaged.
27 When any excessive wear or
scratches are noted on the face of
the piston block, the block
assembly must be replaced. (See Figure 23)
DO NOT LAP THE FACE OF PISTON BLOCK ASSEMBLY.
Numbered End
Gerotor Pocket
2.41 mm
[.095 in.]
Flange
Figure 13
Figure 14
Figure 15
Figure 16
Figure 17
2.79 mm
[.110 in.]
1.91 mm
[.075 in.]
Numbered End
Figure 18
Figure 19
Figure 20
Figure 21
Figure 22
Figure 23
Repair Information

17
Model 70360
28 To remove the input shaft
assembly, use a pair of internal
snap ring pliers and remove the
shaft seal retaining ring from the
housing assembly. (See Figure 24)
29 With the retaining ring
removed, use a small press to
press the shaft seal and input shaft
assembly from the housing
assembly. (See Figure 25)
30 With the input shaft assembly
removed, disassemble the
assembly for inspection by
removing the shaft seal, washer,
retaining ring thrust washers and
bearing. (See Figure 26)
Note: The rear pump on tandem
units uses a spacer in place of shaft
seals.
31 To remove the camplate from the housing assembly, use a
9/16 in. socket or end wrench and remove the three cap
screws retaining the trunnion
coverplate assembly. Start at the
cover plate with trunnion controller
first. (See Figure 27)
32 With the retaining cap screws
removed, insert two small
screwdrivers in the notches located
in the cover plate assembly and pry upward.
33 Remove the tapered roller
bearing from the cam plate. (See
Figure 28)
Note: In most cases this tapered
roller bearing is a slip-fit on the
camplate.
34 With the tapered bearing
removed, remove the shims from
the camplate. (See Figure 29) Use
caution not to misplace or lose
these shims. Note: These shims
may vary in thickness and are used
to adjust camplate end play.
35 Reposition the pump assembly
to remove opposite cover plate.
Repeat steps 31 through 33.
36 Use an o-ring pick or similar
tool remove the o-ring seals from
the two cover plates. (See Figure 30)
37 To remove the control side
cover plate lip seal, use a small
press and press the lip seal inward.
(See Figure 31)
38 With the camplate bearings
removed, slide the camplate toward
the control side and lift it from the
pump housing. (See Figure 32)
Note: The camplate control shaft
will fit out either side of the pump
housing. Be sure to note on which
side of the housing the control
shaft protrudes before removing
camplate from housing for correct
reassembly orientation.
39 Remove the thrust plate from
the camplate. The thrust plate is
reversible and either side may face
the camplate. (See Figure 33)
40 Inspect the housing
assemblies front needle bearing. If
the needles remain in their cage
and move freely, replacement
usually is not required. (See Figure
34)
41 When the needle bearing is
replaced, the numbered end of the
needle bearing must face away
from the housing and pressed to
the dimension as shown. (See
Figure 35)
Figure 24
Figure 25
Figure 26
Figure 27
Figure 28
Figure 29
Figure 30
Repair Information
Figure 31
Figure 32
Figure 33
Figure 34
1.78 mm
[.07 in.]
Numbered End Flange End of Housing
Figure 35

18
Model 70360
Reassembly
1Before reassembling the pump, replace all worn and
damaged parts, assemblies, seals and o-rings. Lubricate the
seals and o-rings with petroleum jelly to help retain them
during reassembly and to provide lubrication to the input and
control shaft seals. Lubricate all finished part surfaces freely
with clean hydraulic fluid to help
provide start up lubrication
between all rotating parts.
2To reassemble the camplate
into the pump housing, tilt the
camplate slightly and install the
control side of the camplate
through the previously noted or
marked side of the housing
assembly. (See Figure 36)
3With the camplate installed,
lubricate and install the tapered
bearing on the non-control arm
side of the camplate. (See Figure
37)
4Lubricate and install the o-ring
seal on trunnion cover. (See Figure
38)
5Install the trunnion cover over
bearing and on pump housing.
Install the three cap screws and
torque to 40,7 Nm [30 ft. lbs.].
(See Figure 39)
6Shims are used to adjust the
camplate’s tapered bearings
preload. The shims used may be
thick, thin or both. When
repairing, start with the same
thickness of shims as those
removed then add or delete to
obtain the proper bearing
preload. (See Figure40)
7Install the shims on the control
arm side of the camplate. (See
Figure 41)
8 With the shims installed,
lubricate and install the tapered
bearing on the control arm side of
the camplate. (See Figure 42)
9Lubricate and install the
control arm shaft seal into the
control arm trunnion cover. Install
with the lip of the seal facing
upward or to the inside of the
pump. (See Figure 43)
10 Lubricate and install the o-ring
seal on the control arm trunnion
cover. (See Figure 44)
11 Install the trunnion cover over
the control shaft and into the pump
housing. Install the three retaining
cap screws and torque to 40,7 Nm
[30 ft. lbs.]. (See Figure 45)
12 Using your fingers, tilt the
camplate back and forth to check
the trunnion bearing preload.
Proper preload is achieved when
the camplate has a very slight
tilting resistance. The camplate
must not have any or very little side
clearance.
13 Reassemble the input shaft
assembly by installing the thrust
washer, thrust bearing, second
thrust washer, retaining ring,
washer and shaft seal. (See
Figure46)
Note: The lip of the shaft seal must
point toward the center of the input
shaft.
14 Install the input shaft assembly
into the housing assembly. Push
the shaft seal in just far enough so
you can start the shaft seal
retaining ring.
15 Use a pair of snap ring pliers
to install retaining snap ring into
the housing assembly. (See Figure
47)
16 Use a seal driver or similar tool
to press or drive the snap ring and
seal into the housing assembly.
(See Figure 48)
CAUTION! Press or drive inward until the snap ring snaps into
the snap ring groove located in the pump housing assembly.
Figure 36
Figure 37
Figure 38
Figure 39
Figure 40
Figure 41
Figure 42
Figure 43
Figure 44
Figure 45
Figure 46
Figure 47
Figure 48
Repair Information

19
Model 70360
17 The thrust plate is reversible.
Either side will fit into the camplate.
In most cases if any irregularities
are noted it is best to replace the
thrust plate. (See Figure 49)
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 50)
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 51)
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 52) 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 53)
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 54)
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 55)
25 Lightly coat the charge pump
assemblies drive key with petroleum
jelly and install it in the drive shaft
assembly. (See Figure 56)
26 Align the keyway 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
57)
Note: Before installing the charge
pum adaptor plate, offset the outer
ring of the geroter as shown.
27 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 52,9 to 56 Nm
[39 to 42 ft. lbs.]. (See Figure 58)
28 Install the two high pressure
relief valves. Torque valves 128,8 to
142,4 Nm [95 to105 ft. lbs.]. (See
Figure 59)
29 Lubricate and reassemble the
bypass valve assembly. Install the
bypass valve into the backplate.
Torque valve to 36,6 to 40,6 Nm [27
to 30 ft. lbs.]. (See Figure 60)
30 Coat the charge pressure
poppet with petroleum jelly and
place poppet onto spring and install
into the adapter plate. (See Figure
61)
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 ft. lbs.].
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 ft. lbs.].
The Model 70360 or 78362 variable displacement pump is now
ready for test and reinstallation.
Figure 49
Figure 50
Figure 51
Figure 52
Figure 53
Figure 54
Figure 55
Figure 56
Figure 57
Figure 58
Figure 59
Figure 60
Figure 61
Repair Information