Caterpillar cat 307 b mini hydraulic excavator (prefix 5cw) service repair manual (5cw00001 and up)

Service Repair Manual
Models
307B Mini Hydraulic
Excavator

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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
(B)
1U-7600 Puller Group 2
3B-7255 Bushing 2
(C)
1U-9352 Engine Stand 1
5P-0979 Adapter 1
FT-1870 Adapter Assembly 1
(D)
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
1/27307B TRACK-TYPE EXCAVATOR 5CW00001-UP (MACHINE) POWERED BY 4...
2020/1/28https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sis...

(J) 1P-1861 Pliers 1
(K) 138-7575 Link Bracket 2
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.

Illustration 1 g00540590
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).
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).

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.
9. Remove O-ring seal (5) from cover (4).
10. Remove gear assembly (8) from the final drive.
11. Use Tooling (F) to remove three retaining rings (6). Remove three gears (7) from the shaft.

12. Remove spacers (9) from each shaft.
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).
14. Remove the coupling (14) from the plate in the final drive.

15. Rotate the final drive and the travel motor, as shown.
16. Remove four bolts (120) and relief valve (121).
17. Remove eight bolts (122). Carefully remove cover assembly (123) from the final drive
housing.
18. Disassemble valve (121), as follows.

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.
c. Remove piston (125) from valve body (124).
d. If it is difficult to remove piston (125), insert a bolt into threaded hole (M3). Use the
bolt to remove the piston.

e. Remove two plugs (126) from valve body (124) and remove O-ring seals from the
plugs.
f. Remove the steel ball (127) from the valve body (124).
g. Remove sleeve (129) from valve body (124).

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.
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.

l. Remove shims (134) from the plug (133).
m. Remove spring retainer (135) from the sleeve (129).
n. Remove spring (136) from sleeve (129).
10/27307B TRACK-TYPE EXCAVATOR 5CW00001-UP (MACHINE) POWERED BY...

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

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.

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.
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.

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 O-
ring 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).

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.
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.

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

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

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).
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).
29. Remove plate (82) from swashplate (81).
30. Disassemble shaft assembly (80), as follows.

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

Caterpillar cat 307 b mini hydraulic excavator (prefix 5cw) service repair manual (5cw00001 and up)

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