Caterpillar Cat 307B MINI HYDRAULIC EXCAVATOR (Prefix 5CW) Service Repair Manual (5CW00001 and up)

Service Repair Manual

Models

307B Mini Hydraulic Excavator

307B TRACK-TYPE EXCAVATOR 5CW00001-UP (MACHINE) POWERED BY 4...

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Shutdown SIS Previous Screen Product: MINI HYD EXCAVATOR Model: 307B MINI HYD EXCAVATOR 5CW Configuration: 307B TRACK-TYPE EXCAVATOR 5CW00001-UP (MACHINE) POWERED BY 4M40 ENGINE

Disassembly and Assembly 307B Excavator Machine Systems Media Number -RENR1091-03

Publication Date -01/09/2000

Date Updated -23/07/2018

i01124475

Final Drive and Travel Motor - Disassemble - Two Speed SMCS - 4050-015; 4351-015

Disassembly Procedure Table 1 Required Tools Tool

Part Number

Part Description

Qty

(A)

138-7573

Link Bracket

2

1U-7600

Puller Group

2

3B-7255

Bushing

2

1U-9352

Engine Stand

1

5P-0979

Adapter

1

FT-1870

Adapter Assembly

1

1U-9895

Crossbar

1

3H-0465

Plate

4

19 mm (0.75 inch)Threaded Rod 254 mm (10 inch) Long

2

8T-1757

Nut

4

(E)

1P-0510

Driver Group

1

(F)

1P-1858

Pliers

1

(G)

FT-1997

Strap

1

(H)

1P-0074

Slide Hammer Puller

1

(B)

(C)

(D)

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(J)

1P-1861

Pliers

1

(K)

138-7575

Link Bracket

2

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Start By: a. Remove the final drive and the travel motor. Refer to Disassembly and Assembly, "Final Drive and Travel Motor - Remove" in this manual.

NOTICE Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.

Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.

Dispose of all fluids according to local regulations and mandates.

1. Thoroughly clean the outside of the travel motor and the final drive prior to disassembly.

2. Remove the sprocket from the final drive and the travel motor. The weight of the sprocket is approximately 23 kg (50 lb).

3. Put an alignment mark across the section of the travel motor and the final drive for assembly purposes. The parts must be reinstalled in the original locations of the parts.

NOTICE Failure to follow the recommended procedure or the specified tooling that is required for the procedure could result in damage to components.

To avoid component damage, follow the recommended procedure using the recommended tools.

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Illustration 1

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4. Fasten Tooling (A) and a hoist to the final drive and the travel motor (1), as shown. The weight of the final drive and the travel motor is 118 kg (260 lb).

5. Fasten the final drive and the travel motor to Tooling (C), as shown. Drain the oil from the final drive into a suitable container for storage or disposal. The capacity of the final drive is 1.7 L (.5 US gal).

Illustration 2

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6. Use a 0.25 mm (.010 inch) feeler gauge to a 0.38 mm (.015 inch) feeler gauge. Remove ring (2) from the groove between cover (4) and final drive housing (3).

Illustration 3

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7. Remove the fill and drain plugs from cover (4) of the final drive. Install the bushing of Tooling (B) in each threaded hole in the cover.

8. Fasten the puller group of Tooling (B) to each bushing, as shown. Carefully remove cover (4) from the housing.

Illustration 4

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9. Remove O-ring seal (5) from cover (4).

10. Remove gear assembly (8) from the final drive.

Illustration 5

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11. Use Tooling (F) to remove three retaining rings (6). Remove three gears (7) from the shaft.

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Illustration 6

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12. Remove spacers (9) from each shaft.

Illustration 7

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13. Disassemble gear assembly (8). Remove ball (10) from the end of shaft (13). Use Tooling (F) to remove retaining ring (11). Remove gear (12) from shaft (13).

Illustration 8

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14. Remove the coupling (14) from the plate in the final drive.

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Illustration 9

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15. Rotate the final drive and the travel motor, as shown.

16. Remove four bolts (120) and relief valve (121).

Illustration 10

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17. Remove eight bolts (122). Carefully remove cover assembly (123) from the final drive housing.

18. Disassemble valve (121), as follows.

Illustration 11

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a. Remove plug (139) from the valve body (124). b. Remove the O-ring seal from plug (139).

Note: Do not reuse the O-ring seal.

Illustration 12

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c. Remove piston (125) from valve body (124).

Illustration 13

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d. If it is difficult to remove piston (125), insert a bolt into threaded hole (M3). Use the bolt to remove the piston.

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Illustration 14

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e. Remove two plugs (126) from valve body (124) and remove O-ring seals from the plugs.

Illustration 15

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f. Remove the steel ball (127) from the valve body (124).

Illustration 16

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g. Remove sleeve (129) from valve body (124).

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Illustration 17

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h. Remove O-ring (131), backup ring (130), and backup ring (132) from the sleeve (129). i. Remove two O-ring seals and four backup rings from valve body (124).

Note: Do not reuse O-ring seals and backup rings.

Illustration 18

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j. Remove the plug (133) from the sleeve (129).

Note: The relief pressure for this valve has been adjusted. Keep the relief valve parts separate, so the parts are not confused with other relief valve parts. k. Remove the O-ring from the plug (133).

Note: Do not reuse the O-ring seal.

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Illustration 19

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l. Remove shims (134) from the plug (133).

Illustration 20

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m. Remove spring retainer (135) from the sleeve (129).

Illustration 21

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n. Remove spring (136) from sleeve (129).

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Illustration 22

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o. Remove valve (137) from sleeve (129).

Illustration 23

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p. Remove piston seal (138) from valve (137). q. Use the above procedure in order to remove the other relief valve.

Note: Replace the O-ring seal and the piston seal, if necessary. Replace the relief valve as an assembly, if other parts need to be replaced.

19. Disassemble the cover assembly (17), as follows.

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Illustration 24

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a. Remove eight springs (26) from the cover assembly. b. Mark the position of timing plate (27) in relation to the cover assembly for installation purposes. Remove timing plate (27) from the cover assembly.

Illustration 25

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Illustration 26

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Brake pilot valve (A) Seal pick (B) Steel rod

c. Remove bearing (28) from the cover assembly. d. Remove two dowels (29) from the cover assembly. e. Remove the brake pilot valve and disassemble the brake pilot valve (30). Use a steel rod with a small diameter to push down on the seat (32). Hold pressure on the seat and remove retaining ring (31) with a seal pick. Remove seat (32), spring (33), and valve (34) from the rear flange. Remove O-ring seal (35) from the seat.

Illustration 27

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Illustration 28

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f. Remove three O-ring seals (39) and plug (36) from the cover. g. Remove displacement change valve and disassemble displacement change valve (37).

Remove the plug and spool assembly (43) and remove spring (42). Remove O-ring seal (44) from the plug. h. Remove two check valves and disassemble two check valves (38). Remove the two plugs and two balls (40). Remove O-ring seal (41) from each plug.

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Illustration 29

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Illustration 30

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i. Remove the counterbalance valve and disassemble the counterbalance valve. Remove plug (53) and plug (62). Remove spring (49) and spring (60). Remove seat (47) and seat (58). Remove spool (55). Remove O-ring seal (51) from plug (53). Remove Oring seal (61) from plug (62). j. Remove the two check valves and disassemble the two check valves. Remove plug (52) and plug (59). Remove spring (48) and spring (56). Remove valve (46) and valve (54). Remove O-ring seal (50) from plug (52). Remove O-ring seal (57) from plug (59).

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Illustration 31

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20. Remove two dowels (63) from the spindle.

21. Remove two O-ring seals (64) from the spindle.

Personal injury or death can result from not following the proper procedures.

To avoid the possibility of injury or death, follow the established procedure.

Note: Piston (66) must be removed from the spindle by using shop air. The piston can come out of the spindle with force during the removal procedure. To prevent possible personal injury, install Tooling (D), as shown. Tooling (D) will retain the piston in the spindle, when shop air pressure is applied.

Illustration 32

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22. Fasten Tooling (D) to the spindle, as shown. Apply shop air at a pressure of 525 kPa (75 psi) to port (65). The piston will move out of the bore in the spindle. Remove Tooling (D) and piston (66) from the spindle.

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Illustration 33

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23. Remove two O-ring seals (67) and two backup rings (68) from piston (66).

Illustration 34

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24. Use a seal pick to remove two separator plates (69) and two friction plates (70).

NOTICE In order to ensure that each piston assembly is installed into its original bore, identify and mark each piston assembly, retaining plate and the barrel before removing the piston assembly.

To avoid damage to the barrel assembly parts, do not allow the parts to separate from the assembly during removal or installation.

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307B TRACK-TYPE EXCAVATOR 5CW00001-UP (MACHINE) POWERED BY...

Illustration 35

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25. Use Tooling (C) to rotate the final drive and the spindle. Carefully remove barrel assembly (71) from the shaft.

26. Disassemble the barrel assembly, as follows.

Illustration 36

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a. Put identification marks on nine piston assemblies (72) in order to indicate the locations of the pistons in the retainer plate (73) and the barrel (71). Remove nine piston assemblies (72) and retainer plate (73) from barrel (71) as a unit. Separate the piston assemblies from the retainer plate.

Illustration 37

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b. Remove guide (74) and three pins (75) from barrel (71).

Illustration 38

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Illustration 39

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Sudden release of spring force can cause injury.

To prevent the possibility of injury, follow the procedure to relieve the spring pressure.

Note: There is spring force against washer (77). When retaining ring (76) is removed, the spring force will release. To prevent possible personal injury, removal of the internal components in barrel (71) must be performed in a press. The press will retain spring (78) and washer (77).

Note: Washer (77) and washer (79) are identical and the washers are interchangeable.

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c. Put barrel (71) in a press. Install Tooling (E) on washer (77). Use Tooling (F) to remove retaining ring (76). Slowly release the spring compression. Remove washer (77), spring (78) and washer (79) from barrel (71).

Illustration 40

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27. Use Tooling (C) to rotate the final drive housing and the spindle, as shown. Remove shaft assembly (80) and swashplate (81) as a unit. If necessary, use a soft faced hammer to remove the components. Tap the shaft from the opposite side in order to free the shaft.

28. Remove swashplate (81) from shaft assembly (80).

Illustration 41

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29. Remove plate (82) from swashplate (81).

30. Disassemble shaft assembly (80), as follows.

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Illustration 42

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Illustration 43

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a. Put shaft assembly (80) in a press. Use Tooling (E) in order to press shaft (83) out of bearing (84).

Illustration 44

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