Caterpillar cat 323 f excavator (prefix mfy) service repair manual (mfy00001 and up)

Service Repair Manual
Models
323F and 323F LN Excavator

Shutdown SIS
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Product: EXCAVATOR
Model: 323F EXCAVATOR MFY
Configuration: 323F LN Excavator MFY00001-UP (MACHINE) POWERED BY C4.4 Engine
Disassembly and Assembly
320F, 323F Excavators Machine Systems
Media Number -M0066628-06 Publication Date -01/09/2018 Date Updated -18/09/2018
i06225993
Travel Motor - Disassemble
SMCS - 4351-015
Disassembly Procedure
Start By:
a. Remove the travel motor.
1. Thoroughly clean the outside of the travel motor prior to disassembly.
2. Fasten the travel motor to a suitable holding fixture in a vertical position. The weight of the
travel motor is 60 kg (132 lb).
3. Put an alignment mark across the head and the body of the travel motor for assembly
purposes. The head must be reinstalled in the original position on the body of the travel
motor.
Illustration 1 g00510326
Note: During the removal of head (2) from the body of the travel motor, be careful not to
scratch or damage the mating surfaces of the components.
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323F LN Excavator MFY00001-UP (MACHINE) POWERED BY C4.4 Engine(M008...
2020/8/17
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4. Remove socket head bolts (1).
5. Remove head (2) from the body of the travel motor.
6. Turn over head (2).
7. Remove O-ring seal (6), shims (5), port plate (4), and bearing (3) from the head.
8. Remove the two check valve assemblies from the head.
Note: There is a retainer under spring (9). This retainer is a press fit in head (2). Do not
remove the retainer.
9. Insert a dowel rod with a small diameter into hole (X). Tap the dowel rod with a plastic
hammer in order to remove spring (9), poppet (8) and seat (7) from the head.
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10. Remove three fittings (10) and plugs (11) from the head. Remove the O-ring seal from each
fitting.
11. Remove three O-ring seals (12) and washer set (13) from the body of the travel motor.
12. Place a shop towel over brake piston (14). Retain brake piston (14) by hand, and apply
approximately 525 kPa (75 psi) of shop air pressure to brake release port (Y). Make sure
that the shop air pressure is free of water. Brake piston (14) will move up the piston guide,
and out of the piston guide. Remove brake piston (14) from the body of the travel motor.
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13. Remove O-ring seal (15) from the brake piston. Remove backup ring (16) from the brake
piston.
14. Remove O-ring seal (17) from the brake piston. Remove backup ring (18) from the brake
piston.
15. Remove piston guide (19), five friction plates (20), and the four steel plates from the body
of the travel motor.
16. Remove O-ring seal (21) from the piston guide. Remove backup ring (22) from the piston
guide.
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Note: Do not allow the components of barrel assembly (23) to come apart during the
removal from the travel motor. All of the components in the barrel assembly must be
reinstalled in the original location.
17. Use two large screwdrivers, as shown. Slowly remove barrel assembly (23) from the body
of the travel motor. Do not allow the components to fall apart.
Note: Shoe retainer (24) and piston shoe assemblies (25) are not serviced separately. Prior
to the removal of the shoe retainer and the piston shoe assemblies from barrel (26), put
identification marks on piston shoe assemblies (25) for assembly purposes. Identification
marks are used to identify the piston shoe assembly's location in shoe retainer (24) and
barrel (26). The piston shoe assemblies must be reinstalled in the piston shoe assembly's
original bores in the shoe retainer and the barrel.
18. Remove shoe retainer (24) and piston shoe assemblies (25) from barrel (26). Separate the
piston shoe assemblies from the shoe retainer.
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19. Remove guide (27), spacer (28) and springs (29) from the barrel.
20. Remove cam plate (30) from the body of the travel motor.
21. Remove two keys (31) and the two locating pins (not shown) from the body of the travel
motor.
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22. Remove O-ring seal (33) from the body of the travel motor.
23. Use a soft faced hammer to remove shaft assembly (34) from the body of the travel motor.
Remove the shaft assembly in the direction that is indicated by the arrow. Refer to
Illustration 14.
24. Remove retaining rings (35) from each side of bearing (36). Push shaft (34) out of bearing
(36) with a press.
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25. Remove inner race (37) from shaft (34).
26. Remove lip seal (38) from the body of the travel motor.
27. Remove two stoppers (39) and the two pistons from the body of the travel motor.
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Mon Aug 17 16:06:10 UTC+0800 2020
8/8
2020/8/17

Shutdown SIS
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Product: EXCAVATOR
i07505849
Travel Motor - Disassemble
SMCS - 4351-015
S/N - MFY1-UP
Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A
1P-2420 Transmission Repair Stand 1
FT-0957 Positioning Gp 4
B
- M16x2 Threaded Rod 3
8T-1757 Nut 6
9X-8268 Washer 6
C 421-5662 Lifting Eye Assembly 1
D 421-5663 Lifting Eye Assembly 2
E
1U-9895 Crossblock 1
3H-0465 Push-Puller Plate 2
8T-0298 Bolt 2
Start By:
a. Remove the travel motor.
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1. Attach the travel motor to Tooling (A) and (B). The weight of the travel motor is
approximately 70 kg (154 lb).
2. Remove plugs (1) and the O-ring seals.
3. Remove plug (2) and the O-ring seal. Repeat for the opposite side.
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Personal injury can result from being struck by parts propelled by a
released spring force.
Make sure to wear all necessary protective equipment.
Follow the recommended procedure and use all recommended tooling to
release the spring force.
4. Remove plug (2A) and the O-ring seal. Repeat for the opposite side.
5. Remove spring (3).
6. Remove spool (4).
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7. Remove bolts (5) and cap (6). Repeat for the opposite side.
8. Remove O-ring seal (10) from cap (6). Remove guide (9), spring (8), and washer (7) from
the head assembly. Repeat for the opposite side.
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9. Remove plug (11), O-ring seal (12), spring (13), and ball (14) from cap (6). Repeat for the
other cap.
10. Remove spool (15).
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11. Remove relief valve (16). Remove O-ring seal (17) from relief valve (16).
12. Repeat for the opposite side.
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13. Remove the nuts of Tooling (B). Remove bolts (19) from head assembly (18).
14. Use Tooling (C) and a suitable lifting device to remove head assembly (18). The weight of
head assembly (18) is approximately 21 kg (47 lb).
15. Remove control plate (20) and bearing (21) from head assembly (18).
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16. Remove pins (22) and springs (23).
17. Remove O-ring seals (24) and (25).
18. Use Tooling (D) and a suitable lifting device to remove housing assembly (26) from
Tooling (A) and place on a suitable bench.
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To avoid personal injury, always wear eye and face protection when
using pressurized air.
19. Attach Tooling (E) to housing (26). Use air pressure to unseat brake piston (27). Remove
Tooling (E) and brake piston (27).
20. Remove back up rings (28) and O-ring seals (29) from brake piston (27).
21. Remove brake piston guide (30).
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22. Remove O-ring seal (31) from brake piston guide (30).
Note: Note the orientation of friction discs (32) and plates (33) for assembly purposes.
23. Remove friction discs (32) and plates (33).
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24. Remove rotating group (34) from housing (26).
25. Remove pistons (35) and retainer (36) from barrel (37).
26. Remove hold down ball (38) and springs (39) from barrel (37).
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27. Remove swashplate (40) from housing (26).
28. Remove pistons (41).
29. Remove springs (42) and shaft (43).
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30. Remove balls (46).
31. Remove bearing (44) and lip seal (45).
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Mon Aug 17 16:07:09 UTC+0800 2020
13/13
2020/8/17

Shutdown SIS
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Product: EXCAVATOR
i06225999
Travel Motor - Assemble
SMCS - 4351-016
Assembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-0510 Driver Gp. 1
B - Loctite Low Breakloose PST -
C - Loctite 242 -
D - O-ring Assembly Compound -
E - Molybdenum Grease -
1. Make sure that all of the components of the travel motor are thoroughly clean and free of
dirt and debris prior to assembly.
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2. Install retaining ring (35) in the groove on shaft (34).
3. Install bearing (36) on shaft (34) with a press. Install the bearing until the bearing contacts
the retaining ring.
4. Install the other retaining ring on the opposite side of bearing (36).
5. Install inner race (37) on the end of shaft (34) until the inner race is seated against the
shoulder on the shaft.
(a) Body
6. Apply Tooling (B) on Surfaces (Y) of the body of the travel motor.
7. Use Tooling (A) in order to install lip seal (38).
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8. Install lip type seal (38) in the body of the travel motor. Install the lip seal so that the sealing
lip is facing in the direction that is shown. Make sure that the lip seal contacts the
counterbore in the body of the travel motor.
Note: Slowly rotate shaft assembly (34) during the installation in order to make sure that the
shaft assembly does not bind in the body of the travel motor.
9. Apply clean hydraulic oil on the lip of lip seal (38).
10. Use a press to install shaft assembly (34) in the body of the travel motor. Slowly rotate the
shaft during the installation in order to make sure that the shaft does not bind. Make sure
that the bearing on the shaft contacts the counterbore in the body of the travel motor.
NOTICE
The locating pin on each key is not centered. In order to prevent
damage to the barrel assembly during assembly of the travel motor, the
keys must be installed as shown. Also, the keys must be installed in the
key's original location in the body of the travel motor.
11. Install the two locating pins and two keys (31) in the body of the travel motor, as shown.
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12. Install cam plate (30) in the body of the travel motor in the original location. Make sure that
the two pistons and two keys (31) in the body of the travel motor engage properly with the
cam plate.
13. Install nine springs (29) in the barrel. Install spacer (28) and guide (27) on the barrel.
14. Install piston shoe assemblies (25) in the original bores in shoe retainer (24).
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Caterpillar cat 323 f excavator (prefix mfy) service repair manual (mfy00001 and up)

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