The document provides instructions for disassembling and assembling a recoil spring assembly for an excavator model 329D L. It describes:
1) The required tools and sockets for disassembly and assembly.
2) The disassembly procedure which involves using a specialized recoil spring bench tool to safely compress the spring and remove components.
3) The assembly procedure which again uses the bench tool to assemble the spring under compression and adjust it to the proper length.
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2. Shutdown SIS
Previous Screen
Product: EXCAVATOR
Model: 329D L EXCAVATOR WLT
Configuration: 329D L Excavator WLT00001-UP (MACHINE) POWERED BY C7 Engine
Disassembly and Assembly
324D, 325D, 326D and 329D Excavators and 329D MHPU Mobile Hydraulic Power
Unit Machine Systems
Media Number -RENR8646-22 Publication Date -01/02/2015 Date Updated -12/09/2018
i06889712
Recoil Spring - Disassemble
SMCS - 4158-015
Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description QTY
A 4C-9540 Recoil Spring Bench 1
B
146-2457 Hydraulic Power Supply Gp 1
223-3506 Hydraulic Cylinder and Lines Gp 1
C 8S-9971 Adapter 1
Table 2
Required Sockets
Thread Socket Part Number
M36 138–5189
M42
4C-4467
193–8100 (1)
M48
5S-6081
FT-3033 (2)
371–1080 (3)
M64 5S-6086
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3. (1)
Used with M42 flat sided nut.
(2)
Used with M48 flat sided nut that is 54 mm (2.13 inch) between the two flats.
(3)
Used with M48 flat sided nut that is 65 mm (2.56 inch) between the two flats.
Start By:
a. Remove the front idler and the recoil spring assembly.
The spring of the recoil spring assembly is compressed under several
tons of force.
Do not attempt to compress or release the tension of the spring with the
nut on the end of the retaining rod.
Damaged threads on the retaining rod or nut can cause the assembly to
come apart with force, resulting in injury or death.
1. Prior to disassembling the recoil spring assembly, make sure that Tooling (A) is on a level
surface.
2. Prior to disassembling the recoil spring thoroughly clean the outside surface.
Illustration 1 g00483426
3. Install Tooling (C) on Tooling (B), as shown.
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4. Illustration 2 g00494710
Illustration 3 g00483437
Note: Two adjustable supports (1), reaction plate (2), and movable plate (3) are part of
Tooling (A).
4. Adjust the spacing between reaction plate (2) and movable plate (3). The spacing is
approximately the same length as the recoil spring assembly (free length). Also, make sure
that two adjustable supports (1) are positioned between the reaction plate and the movable
plate, as shown. Level the two supports.
Note: The recoil spring assembly may be installed in Tooling (A) from the end. In this case,
reaction plate (2) must be removed. Then reinstall the reaction plate after the recoil spring
assembly is in place on two adjustable supports (1).
NOTICE
Do not remove the hoist from the recoil spring assembly until the unit
is leveled, centered and locked in the specified tooling.
5. The combined weight of the recoil spring assembly is approximately 116 kg (255 lb).
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5. 6. Fasten a suitable lifting device to the recoil spring assembly. Put the recoil spring assembly
in position on two adjustable supports (1) in Tooling (A).
7. Adjust the two adjustable supports to align the centerline of the recoil spring assembly with
the centerline of Tooling (A).
Illustration 4 g00498760
The hoist has been removed from the recoil spring assembly to provide a better illustration of level gauge (4).
8. Put a level gauge (4) on the recoil spring assembly.
Illustration 5 g00498781
9. Reposition the recoil spring assembly until the recoil spring assembly is level. Reposition
the recoil spring assembly until the retaining rod and nut (6) are centered in the hole in
reaction plate (2).
10. The recoil spring assembly is leveled by moving adjustable supports (1) higher or lower.
After the recoil spring assembly is leveled and centered, install two pins (5) on the back side
of reaction plate (2), as shown.
11. Operate Tooling (B) to hold the recoil spring assembly in position between reaction plate
(2) and movable plate (3) (not shown). Make sure that the recoil spring assembly is level
and centered.
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6. Illustration 6 g00498784
12. Close covers (7) on Tooling (A). Use Tooling (B) to compress the recoil spring assembly
slightly.
Illustration 7 g02148287
Several tons of force are required to compress the recoil spring during
assembly.
Do not compress the spring assembly until the covers on the tooling have
been closed.
It is possible for the recoil spring to twist under load and come out of the
tooling resulting in injury or death.
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7. 13. Through the opening in the end of Tooling (A), remove the socket head bolts and lock strip
(8) from the end of the retaining rod.
14. Remove nut (6). Refer to Table 2 for the correct socket part number. Release the force on
the recoil spring assembly.
15. Open the covers on Tooling (A). Attach a suitable lifting device to the recoil spring
assembly, and remove the recoil spring assembly from Tooling (A).
16. Separate the components of the recoil spring assembly. Remove support (12), spring (10),
support (9), and rod (11).
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
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8. Shutdown SIS
Previous Screen
Product: EXCAVATOR
Model: 329D L EXCAVATOR WLT
Configuration: 329D L Excavator WLT00001-UP (MACHINE) POWERED BY C7 Engine
Disassembly and Assembly
324D, 325D, 326D and 329D Excavators and 329D MHPU Mobile Hydraulic Power
Unit Machine Systems
Media Number -RENR8646-22 Publication Date -01/02/2015 Date Updated -12/09/2018
i06889768
Recoil Spring - Assemble
SMCS - 4158-016
Assembly Procedure
Table 1
Required Tools
Tool Part Number Part Description QTY
A 4C-9540 Recoil Spring Bench 1
B
146-2457 Hydraulic Power Supply Gp 1
223-3506 Hydraulic Cylinder and Lines Gp 1
C 8S-9971 Adapter 1
E 9S-3263 Thread Lock Compound 1
Table 2
Required Sockets
Thread Socket Part Number
M36 138–5189
M42
4C-4467
193–8100 (1)
M48
5S-6081
FT-3033 (2)
371–1080 (3)
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9. M64 5S-6086
(1)
Used with M42 flat sided nut.
(2)
Used with M48 flat sided nut that is 54 mm (2.13 inch) between the two flats.
(3)
Used with M48 flat sided nut that is 65 mm (2.56 inch) between the two flats.
The spring of the recoil spring assembly is compressed under several
tons of force.
Do not attempt to compress or release the tension of the spring with the
nut on the end of the retaining rod.
Damaged threads on the retaining rod or nut can cause the assembly to
come apart with force, resulting in injury or death.
Note: Prior to assembling the recoil spring assembly, make sure that Tooling (A) is on a
level surface.
Illustration 1 g01157185
1. Check the condition of the threads on rod (11) and nut (6). If the threads are worn or
damaged, use new parts for replacement.
2. Assemble the recoil spring assembly loosely. Position spring (10) onto support (9). Install
rod (11) into support (9). Position support (12).
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10. Illustration 2 g00483426
3. Install Tooling (C) on Tooling (B).
Illustration 3 g00494710
Illustration 4 g00483437
Note: Two adjustable supports (1), reaction plate (2), and movable plate (3) are part of
Tooling (A).
4. Adjust the spacing between reaction plate (2) and movable plate (3) so that the spacing is
approximately the same length as the recoil spring assembly. Also, make sure that two
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11. adjustable supports (1) are positioned between the reaction plate and the movable plate, as
shown. Level the two supports.
Note: The recoil spring assembly may be installed in Tooling (A) from the end. In this case,
reaction plate (2) must be removed. Then reinstall the reaction plate after the recoil spring
assembly is in place on two adjustable supports (1).
NOTICE
Do not remove the hoist from the recoil spring assembly until the unit
is leveled, centered and locked in the specified tooling.
5. The combined weight of the recoil spring assembly is approximately 116 kg (255 lb).
6. Fasten a suitable lifting device to the recoil spring assembly. Put the recoil spring assembly
in position on two adjustable supports (1) in Tooling (A).
7. Adjust the two adjustable supports to align the centerline of the recoil spring assembly with
the centerline of Tooling (A).
Illustration 5 g00949740
The hoist has been removed from the recoil spring assembly to provide a better illustration of level gauge (4).
8. Operate Tooling (B) and guide the end of the recoil spring assembly through the hole in
reaction plate (2). Put a level gauge (4) on the recoil spring assembly. Make sure that the
recoil spring assembly is level and centered in Tooling (A). Remove the suitable lifting
device from the recoil spring assembly.
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12. Illustration 6 g00498784
Improper assembly of parts that are spring loaded can cause bodily
injury.
To prevent possible injury, follow the established assembly procedure
and wear protective equipment.
9. Close covers (7) on Tooling (A). Compress the recoil spring assembly with Tooling (B).
Illustration 7 g01157190
(X) Compressed length of the spring
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13. Illustration 8 g00498784
10. Open the covers on Tooling (A). Measure the compressed length of the recoil spring. The
compressed length is Dimension (X). Refer to Table 3 for the correct compressed spring
length.
Table 3
Recoil Spring Compressed Length
Model Dimension (X)
315D 448.0 mm (17.64 inch)
319D 550.0 mm (21.65 inch)
320D 550.0 mm (21.65 inch)
323D
550.0 mm (21.65 inch)
686.0 mm (27.01 inch)(1)
324D 606.0 mm (23.86 inch)
325C 551.0 mm (21.69 inch)
325D
686.0 mm (27.01 inch)
845.0 mm (33.27 inch)(2)
326D L 606.0 mm (23.86 inch)
328D 644.0 mm (25.35 inch)
329D 686.0 mm (27.01 inch)
330D
644.0 mm (25.35 inch)
785.0 mm (30.91 inch)(3)
336D
644.0 mm (25.35 inch)
785 mm (30.91inch)(4)
(1)
This Dimension is for (S/N: DKW1-Up; SED1-Up; NES1-Up)
(2)
This Dimension is for (S/N: GBR1-Up; MCL1-Up)
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14. (3)
This Dimension is for (S/N: ERN1-Up)
(4)
This Dimension is for (S/N: DTS1-Up; LMG1-Up; JWR1-Up)
11. If the assembled length is not correct, close covers (7) on Tooling (A), and adjust the spring
length with Tooling (B). If the assembled length is correct, then assembly of the recoil
spring assembly can be completed.
Illustration 9 g01157193
12. Apply a rust inhibitor to the threads on the end of the retaining rod for the recoil spring.
Install nut (6). Tighten nut (6). Refer to Table2 for the correct socket part number.
13. Apply Tooling (E) on the threads of the socket head bolts that hold strip (8) in place. Install
the strip and the socket head bolts that hold the strip.
14. Attach a suitable lifting device to the recoil spring assembly, and remove the recoil spring
assembly from Tooling (A). The weight of the recoil spring assembly is approximately
116 kg (255 lb).
End By:
a. Install the front idler and the recoil spring.
Copyright 1993 - 2020 Caterpillar Inc.
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15. S/N - WDK1-UP
S/N - WLT1-UP
S/N - XDB1-UP
S/N - YFW1-UP
Removal Procedure
1. Start the engine. Park the machine on a hard, level surface. Stop the engine.
2. Release the tension on the track assembly. Refer to Operation and Maintenance Manual,
"Track Adjustment - Adjust".
Illustration 1 g01155049
3. Use two people, a block, and a pry bar in order to support hydraulic track adjuster (1). The
weight of hydraulic track adjuster (1) is approximately 39 kg (85 lb).
Illustration 2 g01206571
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16. Top View
4. Remove bolts (2).
Illustration 3 g01155052
5. Lower hydraulic track adjuster (1) into position between rollers (3). Remove hydraulic track
adjuster (1).
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17. Start By:
a. Disassemble the recoil spring.
Illustration 1 g02723302
1. Remove piston assembly (5) from cylinder (2). Remove rod assembly (1) from cylinder (2). Remove
seal assembly (6) from cylinder (2)
2. Remove O-ring seal (4) and backup ring (3) from cylinder (2).
Illustration 2 g00526453
3. Remove O-ring seals (9), rings (8), and rings (7) from the grooves in piston assembly (5).
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18. Illustration 3 g00526454
4. Remove bolts (11). Remove plate (10).
Illustration 4 g00526455
5. Remove relief valve (12).
6. Remove fill valve (13).
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19. Thank you very much for
your reading. Please Click
Here. Then Get COMPLETE
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20. Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-0520 Driver Group 1
B 5P-0960 Molybdenum Grease
Note: Make sure that all of the parts of the hydraulic track adjuster are clean and free of dirt and debris
prior to assembly.
1. Make sure that all of the passages in the piston assembly are filled with Tooling (B). Make sure that
air is not trapped in the passages in the piston assembly.
Illustration 1 g00526455
2. Install relief valve (12) in the body of the piston assembly. Do not tighten the relief valve.
3. Install fill valve (13) in the body of the piston assembly. Tighten the fill valve snugly. Do not torque
the fill valve.
Illustration 2 g00526454
4. Install plate (10). Install bolts (11) which secure plate (10).
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21. Illustration 3 g00526453
Note: Completely fill the seal grooves in the piston assembly with Tooling (B). The grease will
displace air when the O-ring seals and the backup rings are installed.
5. Install backup rings (7), backup rings (8), and O-ring seals (9) on piston assembly (5).
Note: O-ring seals and backup rings must be installed in the correct position in order to ensure the
correct operation of the hydraulic track adjuster. Backup rings are distinguished by the color of the
ring. Backup rings (7) are black in color. Backup rings (8) are brown in color.
Illustration 4 g02723581
Note: Completely fill in the seal groove for O-ring seal (3) and backup ring (4) in cylinder (2) with
Tooling (B). The grease will displace air when the O-ring and the backup ring are installed.
6. Install O-ring seal (4) and backup ring (3) in cylinder (2).
7. Apply Tooling (B) in the groove for lip seal (6). Use Tooling (A) to install lip seal (6). Install lip seal
(6) until the seal is 0.5 ± 0.5 mm (0.02 ± 0.02 inch) below the surface of cylinder (2). Install lip seal
(6) with the lip toward the outside of cylinder (2).
8. Check the condition of the threads on rod (1). If the threads are damaged or worn, replace rod (1)
with a new part. Put a small amount of Tooling (B) on the sliding surface of rod (1). Install rod (1) in
cylinder (2).
9. Fill the cavity of cylinder (2) with Tooling (B).
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22. 10. Put a small amount of Tooling (B) on the sliding surface of piston assembly (5). Put a minimum of
60 cc (4 in3
) of Tooling (B) on the end of piston assembly (5). This grease will prevent air from
displacing grease in the cylinder during the installation of the piston. Make sure that the grease
covers backup rings (7) and (8) and O-ring seal (9).
11. Center piston assembly (5) in cylinder (2). Insert the piston assembly into the cylinder.
Note: It may be necessary to use a soft faced hammer to install the piston assembly into the cylinder.
12. Make sure that grease is expelled from the vent hole for the relief valve. Tighten relief valve (12) to
a torque of 34 ± 5 N·m (25 ± 4 lb ft).
13. Add approximately 5 cc (.3 in3
) of Tooling (B) through fill valve (13). Apply a force to piston
assembly (5) and open fill valve (13) in order to purge all the air from the hydraulic track adjuster.
14. Tighten fill valve (13) to a torque of 34 ± 5 N·m (25 ± 4 lb ft).
End By:
a. Assemble the recoil spring.
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