Eaton 704342 Repair Information Download Page 6

6

Model 70342 and 70344

Parts List

Item

Qty.

Description

+ 1

1

O-ring, 2.38 mm Dia. x 36.5 mm I.D. [ .0937 in. Dia. x 1.4375 in. I.D.]

2

2

Dowel Pin

3

2

Washer

+ 4

1

Retaining Ring

+ 5

2

Retaining Ring

6

4

Screw

7

2

Spring

8

2

Plug Assembly

+ 8-1

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 #6)

10

1

Seal Cover

11

1

Trunnion Cover

12

1

O-ring Cover

13

1

Inner Race

14

2

Needle Bearing

+ 15

1

Housing Gasket

16

2

Thrust Race

17

1

Needle Thrust Bearing

18

2

Cap Screws (Locations on page #6)

3/8-16, 57.2 mm [2.25 in.] Long
3/8-16,101.6 mm [4.0 in.] Long

19

2

Cap Screws (Locations on page #6)

3/8-16, 38.1 mm [1.5 in.] Long
3/8-16, 50.8 mm [2.0 in.] Long
3/8-16, 88.9 mm [3.5 in.] Long

+ 20

1

Shaft Seal, Drive

20

1

Viton Shaft Seal, Drive

20

1

Spacer (Used in rear pump of tandem in place of drive shaft seal.)

+ 21

1

Shaft Seal, Trunnion

21

1

Viton Shaft Seal, Trunnion

22

1

Relief Valve for Port "C" (Identification drawing on page #7)

23

1

Relief Valve for Port "D" (Identification drawing on page #7)

24

1

Housing Assembly (Identification drawing on page #7)

24-1

1

Bearing (press fit)

25

1

Backplate Assembly (Identification drawing and parts list on page #8 & #9)

26

1

Valve Plate (Identification drawing on page  #3)

Righthand (CW) Rotation
Lefthand (CCW) Rotation

27

1

Drive Shaft (Identification drawing on page  #12)

28

1

Camplate

Key groove in trunnion
Cross hole in trunnion

29

1

Charge Pump Adaptor (Identification drawing and parts list on page #10 & #11)

30

1

Inner Gerotor

6.9 cm

3

/r [.42 in

3

/r] displacement, 6.35 mm [.25 in ] width

13.8 cm

3

/r [.84 in

3

/r] displacement, 12.7 mm [.5 in] width

31

1

Outer Gerotor

6.9 cm

3

/r [.42 in

3

/r] displacement, 6.35 mm [.25 in ] width

13.8 cm

3

/r [.84 in

3

/r] displacement, 12.7 mm [.5 in] width

32

1

Key, Drive Shaft

Used with 25.4 mm[1.00 in] dia. drive shaft.
Used with 22.2 mm [.875 in] dia. drive shaft.

33

1

O-ring (In K2 & K3 kit)

35

1

Mounting Bracket

36

1

Cover Plate (In K3 kit)

Summary of Contents for 704342

Page 1: ...o 7 620 January 1996 Eaton Medium Duty Piston Pump Repair Information Model 70342 and 70344 40 6 cm3 r 2 48 in3 r Displacement Manually Variable Displacement Piston Pump 70342 78341 Tandem 70344 70342...

Page 2: ...emely 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...

Page 3: ...16 Inch Hex Key Allen 9 16 End Wrench T 25 Torx Screwdriver Soft Face Hammer Internal Retaining Pliers Straight 090 Tip External Retaining Pliers Straight 070 Tip Regular or Locking Pliers Seal Drive...

Page 4: ...n below is typical of a righthand rotation pump 24 1 24 14 3 3 14 13 21 10 6 1 12 11 6 28 9 42 Date Code and Assembly Number Location 20 41 5 16 17 16 5 4 27 Shaft assembly for rear pump of tandem 27...

Page 5: ...23 7 8 1 8 38 30 31 39 29 18 19 61 45 25 3 25 1 29 1 33 36 43 K3 Used in place of Auxiliary pump K2 37 1 37 25 1 25 2 26 15 2 25 22 7 8 1 8 23 7 8 1 8 18 25 3 25 3 3 25 3 3 25 3a 19 K1 K2 1 K2 2 K2 3...

Page 6: ...Seal Trunnion 21 1 Viton Shaft Seal Trunnion 22 1 Relief Valve for Port C Identification drawing on page 7 23 1 Relief Valve for Port D Identification drawing on page 7 24 1 Housing Assembly Identific...

Page 7: ...3 2 Cap Screws K2 1 Gear Pump Mounting Kit K2 1 1 O ring 1 59 mm Dia x 82 55 mm ID 0625 in Dia x 3 25 in ID K2 2 1 Washer K2 3 2 Cap Screws K3 1 Cover Plate Kit K3 1 1 O ring 1 59 mm Dia x 82 55 mm I...

Page 8: ...8 mm 07 in Numbered End Flange End of Housing Figure 1 4 12 Discard the shaft seal gaskets and o rings from all assemblies Replace with new seals upon reassembly The following instructions apply to a...

Page 9: ...in contact with camplate Check all parts for proper position before proceeding 9 Clamp pump assembly in a protected jaw vise with the open end of the housing up Install gasket and two dowel pins onto...

Page 10: ...spring Inspect the bearing inside the charge pump adapter The bearing needles must remain in the bearing cage and bearing at dimension shown in figure 1 2 Inspect the gerotor pocket inside the charge...

Page 11: ...1 ea 3 8 in N C nut To remove spring place one of the flat washers over the 3 8 in x 3 1 4 in cap screw Put cap screw through the center of the piston block and apply the second washer Let washer rest...

Page 12: ...ssion problems Match the transmission symptoms with the problem statements and follow the action steps shown in the box diagrams This will give expedient aid in correcting minor problems eliminating u...

Page 13: ...fective Below Level Repair or Replace Check System Pressure Reduce System Load High OK 9 Inspect Charge Relief Valve OK 11 Inspect Charge Pump 13 Inspect Motor 12 Inspect Inlet Screen or Filter Replac...

Page 14: ...erates in One Direction Only Inspect Servo Control If used OK OK OK 2 7 Defective Repair or Replace Inspect Motor 12 Replace Clogged Check Charge Pressure 10 Low OK Inspect Dump Valve If used Replace...

Page 15: ...Valve OK 11 Inspect Charge Pump 13 Inspect Motor 12 Inspect Inlet Screen or Filter Replace Clogged OK 8 Check Charge Pressure 10 Low OK OK Replace Pump Motor Inspect Servo Control If used OK 2 Inspect...

Page 16: ...bstructed inlet or outlet c open inlet to charge pump 9 Check System Pressure a See figure 3 1 for location of pressure gauge installation b consult owner operators manual for maximum system relief va...

Page 17: ...injectors and turn the engine over for 15 seconds 5 Replace the coil wire or return the fuel flow to the injectors Place the transmission unit in the neutral position start the engine and run it at a...

Page 18: ...18 Model 70342 and 70344 Notes...

Page 19: ...19 Model 70342 and 70344 Notes...

Page 20: ...Eden Prairie MN 55344 Telephone 612 937 9800 Fax 612 937 7130 Eaton Ltd Hydraulics Division Glenrothes Fife Scotland KY7 4NW Telephone 01 592 771 771 Fax 01 592 773 184 Eaton GmbH Hydraulics Products...

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