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Parts included in 74418-904 and 74448-900 seal repair kits.

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Parts included in 74448-900 thru shaft backplate seal repair kit.

Dimensions are in Metric [U.S.].

Parts List - 74318 and 74348 Piston Motor

Item

No.

Description

Quantity

+

1

Retaining Ring

1

+

2

Shaft Seal

1

3

Washer

1

+

4

Retaining Ring

2

5

Thrust Race

2

6

Thrust Bearing

1

7

Drive Shaft

1

8

Key

1

8A

Key (Used on thru shaft only)

1

9

Housing Assembly (Includes item #10)

1

10

         Needle Bearing

1

11

Camplate Insert

1

12

Rotating Kit Assembly (Includes item # 13 thru #21)

1

13

        Piston Assemby

9

14

        Spider

1

15

        Spider Pivot

1

16

        Pin Keeper

1

17

        Piston Block

1

18

        Pins

3

19

        Washer

2

20

        Spring

1

21

        Retaining Ring

1

22

Valve Plate

1

+

23

O - ring, 2.38 mm x 101.6 mm [3/32 in. x 4 in.]

1

24

Backplate Assembly (Includes item #25 thru # 27)

1

25

        Needle Bearing

1

26

        Roll Pin

2

27

        Roll Pin

1

28

Cap Screws

6

28A

Cap Screws (Use with same side porting)

3

28B

Cap Screws (Use with same side porting)

3

++

29

Shaft Seal (In thru shaft backplate) 

1

++

30

Retaining Ring (In thru shaft backplate) 

1

Seal Repair Kit (74418-904)

1

Seal Repair Kit (74448-900) (Used w/ thru shaft 
backplate)

1

Summary of Contents for 74318

Page 1: ...Model 74318 and 74348 Piston Motors Fixed Displacement Valve Plate Design Eaton Medium Duty Piston Pump Repair Information...

Page 2: ...29 30 Include Housing Assy 9 Camplate Insert 11 Rotating Kit Assy 12 Valve Plate 22 O ring 23 28A 28B 24 Date Code and Assembly Number Location Parts Drawing Copyright 1991 Eaton Corporation Thru Shaf...

Page 3: ...Camplate Insert 1 12 Rotating Kit Assembly Includes item 13 thru 21 1 13 Piston Assemby 9 14 Spider 1 15 Spider Pivot 1 16 Pin Keeper 1 17 Piston Block 1 18 Pins 3 19 Washer 2 20 Spring 1 21 Retaining...

Page 4: ...ea 3 8 in N C nut Place one of the flat washers over the 3 8 in x 3 1 4 in cap screw and place this through the center of the piston block Place the other washer over the cap screw and let it rest on...

Page 5: ...compress the spring and retain with retaining ring 21 Remove the nut cap screw and the two washers 8 Install the pivot 15 spider 14 and the piston assemblies 13 on the piston block 17 Install rotatin...

Page 6: ...ace of valve plate if scored replace valve plate B Scored or worn piston shoes B Disassemble motor examine condition of shoes on pistons replace rotating kit assembly as a complete set Do Not Lap pist...

Page 7: ...7...

Page 8: ...Engineering change code Last number of year built 00 00 00 Data Code 74318 DAV Assembly Number Week of year 0 thru 52 Testers initials Example ot numbers on flange Identifies type of product 74 Fixed...

Page 9: ...rie MN 55344 USA Tel 952 937 9800 Fax 952 294 7722 www eaton com hydraulics Eaton Fluid Power Group Hydraulics Business Europe Route de la Longeraie 7 1110 Morges Switzerland Tel 41 0 21 811 4600 Fax...

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