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Service Repair Manual
Model
320C, 320C L, 320C LN,
320C S Excavator

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Product: EXCAVATOR
Model: 320C EXCAVATOR BEA
Configuration: 320C, 320C L, 320C LN, 320C S Excavators BEA00001-UP (MACHINE) POWERED BY 3066 Engine
Disassembly and Assembly
320C Excavator Machine Systems
Media Number -RENR3826-16 Publication Date -01/11/2014 Date Updated -30/03/2016
i02544012
Bucket Cylinder - Remove and Install
SMCS - 5457-010
Removal Procedure
Cylinders equipped with lock valves can remain pressurized for very
long periods of time, even with the hoses removed.
Failure to relieve pressure before removing a lock valve or
disassembling a cylinder can result in personal injury or death.
Ensure all pressure is relieved before removing a lock valve or
disassembling a cylinder.
Note: Cleanliness is an important factor. Before the disassembly procedure, the exterior of the component
should be thoroughly cleaned. This will help to prevent dirt from entering the internal mechanism.
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 Dealer Service
Tool Catalog" for tools and supplies suitable to collect and contain
fluids on Caterpillar products.
Dispose of all fluids according to local regulations and mandates.
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2019/10/15https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sis...

At operating temperature, the hydraulic oil is hot and under pressure.
Hot oils can cause burns.
To prevent possible personal injury, release the pressure in the work
tool hydraulic circuit (boom, stick, bucket, and swing), travel circuits,
and the hydraulic oil tank at the filler cap before any hydraulic lines or
components are disconnected or removed.
Remove the filler cap only when the engine is stopped and the filler cap
is cool enough to touch.
Note: Put identification marks on all lines, on all hoses, on all wires, and on all tubes for installation
purposes. Plug all lines, hoses, and tubes. This helps to prevent fluid loss and this helps to keep
contaminants from entering the system.
1. Release the hydraulic system pressure. Refer to Disassembly and Assembly, "System Pressure -
Release".
Illustration 1 g00555749
2. Fasten a suitable lifting device to the rod end of the bucket cylinder, as shown. Put suitable blocking
(3) under the link assemblies as a support.
3. Remove the nuts and retaining bolt (1) . Remove pin (2) .
4. Note the location and the quantity of the shims between the power link and the idler link. Remove
the shims.
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5. Raise bucket cylinder (4) until bucket cylinder (4) is level. Fasten a suitable lifting device to the head
end of bucket cylinder (4) , as shown. Disconnect hose assemblies (5) .
6. Remove retaining bolt (6) , pin assembly (7) , and the spacer. Remove the bucket cylinder. The
weight of the bucket cylinder is approximately 150 kg (330 lb).
7. Note the location and the quantity of shims on both sides of the bucket cylinder at the stick pin.
Remove the shims.
Disassembly and Assembly Information
Table 1
Required Tools
Tool Part Number Part Description Qty
A
127-4904 Hydraulic Cylinder Repair Stand Gp 1
1P-0520 Driver Gp 1
9U-7868 Spanner Wrench 1
127-8064 Adapter Plate Gp 1
195-4609 Seal Pick 1
B 4C-4032 Bearing Mount Compound 1
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C 5P-0960 Grease Cartridge 1
Cylinders equipped with lock valves can remain pressurized for very
long periods of time, even with the hoses removed.
Failure to relieve pressure before removing a lock valve or
disassembling a cylinder can result in personal injury or death.
Ensure all pressure is relieved before removing a lock valve or
disassembling a cylinder.
Note: Apply a light film of hydraulic oil to all components before assembly.
1. Apply Tooling (B) to seal (1) prior to assembly.
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2. Apply clean hydraulic oil on the lip of seal (1) , seal (2) , and seal (3) .
3. Apply Tooling (C) to the threads of head (5) .
4. Lubricate the threads of rod assembly (7) with Tooling (C) .
5. Tighten locknut (8) to a torque of 7600 ± 380 N·m (5605 ± 280 lb ft).
6. Install ball (10) and setscrew (9) in locknut (8) . Tighten setscrew (9) to a torque of 57 ± 10 N·m (42
± 7 lb ft).
7. Lubricate the outside of piston (6) with Tooling (C) .
8. Tighten bolts (4) to a torque of 267 ± 40 N·m (197 ± 30 lb ft).
Installation Procedure
Table 2
Required Tools
D 5P-0960 Grease Cartridge 1
Note: Cleanliness is an important factor. Before assembly, all parts should be thoroughly cleaned in
cleaning fluid. Allow the parts to air dry. Wiping cloths or rags should not be used to dry parts. Lint may
be deposited on the parts which may cause later trouble. Inspect all parts. If any parts are worn or damaged,
use new parts for replacement.
1. Fasten a suitable lifting device to bucket cylinder (4) . The weight of bucket cylinder (4) is
approximately 150 kg (330 lb). Place bucket cylinder (4) in position in the stick. Lower the head end
of bucket cylinder (4) into the brackets on top of the stick. Make sure that the pin bores in the stick
are in alignment with the pin bores in the bucket cylinder. Make sure that the grease fittings in the
head end and in the rod end of bucket cylinder (4) are facing away from the stick.
2. Install the shims on both sides of the bucket cylinder at the bore for pin assembly (7) .
3. Install pin assembly (7) .
4. Install retaining bolt (6) . Tighten retaining bolt (6) to a torque of 460 ± 60 N·m (340 ± 44 lb ft).
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5. Install O-ring seals in the ends of hose assemblies (5) . Connect hose assemblies (5) to bucket
cylinder (4) .
6. Lower the bucket cylinder between the link assemblies. Install the shims on both sides of the power
link between the power link and the idler links.
7. Apply a thin coat of Tooling (D) on pin (2) . Make sure that the bore in the bucket cylinder rod is in
alignment with the bores in the link assemblies. Install pin (2) . Install retaining bolt (1) and the two
nuts.
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8. Tighten the nuts on retaining bolt (1) . Tighten the outside nut until the nut is 0.5 mm (0.02 inch)
beyond the end of the retaining bolt, as shown. Tighten the inside nut against the outside nut to a
torque of 460 ± 60 N·m (340 ± 44 lb ft).
9. Fill the hydraulic oil tank with oil to the correct level. Refer to Operation and Maintenance Manual,
"Refill Capacities".
10. Start the engine, and run the engine at a low idle speed. Raise the bucket from the ground. Extend
and retract the bucket cylinder approximately ten times in order to remove the air from the hydraulic
system.
11. Recheck the oil level in the hydraulic oil tank. If necessary, refill the hydraulic oil tank to the correct
level.
Copyright 1993 - 2019 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Tue Oct 15 09:41:11 UTC+0800 2019
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Product: EXCAVATOR
i01862522
Drift Reduction Valve (Stick) - Remove
SMCS - 5143-011-JJ
Removal Procedure
Table 1
Required Tools
A FT-2674 Vacuum Cap 1
Start By:
a. Release the hydraulic system pressure. Refer to Disassembly and Assembly, "Hydraulic
System Pressure - Release" .
NOTICE
Keep all parts clean from contaminants.
Contamination of the hydraulic system with foreign material will
reduce the service life of the hydraulic system components.
To prevent contaminants from entering the hydraulic system, always
plug or cap the lines, fittings, or hoses as they are disconnected. Cover
any disassembled components and clean them properly before
assembly.
Clean the hydraulic system properly after any major component
exchange or especially after a component failure, to remove any
contamination.
1/4(W)w

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, "Dealer Service Tool
Catalog" for tools and supplies suitable to collect and contain fluids on
Cat?
products.
Dispose of all fluids according to local regulations and mandates.
Note: A hydraulic oil sample should be obtained before any maintenance is performed in order to
establish the system contaminant level. Refer to Fluid Analysis Laboratory Guide, SEBF3116,
"Obtaining an Oil Sample for S·O·S Analysis". Refer to Operation and Maintenance Manual,
"Sampling Interval and Location of Sampling Valve" for the correct location.
1. Remove the cap from the hydraulic tank. Attach Tooling (A) to the hydraulic tank.
Note: Hook up the air to Tooling (A) in order to create a vacuum in the hydraulic system.
This will minimize the leakage from the hose assemblies.
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2. Remove bolts (1) and the washers in order to remove cover (2).
3. Remove socket head bolts (3) and the split flanges in order to disconnect hose assembly (4)
from the stick drift reduction valve.
4. Remove bolts (6), the washers, and the split flanges in order to disconnect hose assembly
(7) from the stick drift reduction valve.
5. Disconnect hose assemblies (5).
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6. Remove bolts (8).
7. Remove stick drift reduction valve (9).
Tue Oct 15 09:42:06 UTC+0800 2019
4/4(W)w

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Product: EXCAVATOR
i02696617
Drift Reduction Valve (Stick) - Disassemble
SMCS - 5143-015-JJ
Disassembly Procedure
Table 1
Required Tools
A 6V-7981 Bolt (M10-1.5 by 70mm) 2
Start By:
a. Remove the stick drift reduction valve. Refer to Disassembly and Assembly, "Drift
Reduction Valve (Stick) - Remove".
NOTICE
Keep all parts clean from contaminants.
Contamination of the hydraulic system with foreign material will
reduce the service life of the hydraulic system components.
To prevent contaminants from entering the hydraulic system, always
plug or cap the lines, fittings, or hoses as they are disconnected. Cover
any disassembled components and clean them properly before
assembly.
Clean the hydraulic system properly after any major component
exchange or especially after a component failure, to remove any
contamination.
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Note: Cleanliness is an important factor. Before the disassembly procedure, the exterior of the
component should be thoroughly cleaned. This will prevent dirt from entering the internal
mechanism.
1. Remove bolts (1) and the washers. Remove half flanges (2) and the cover. Remove fittings
(3) from valve body (4).
2. Remove O-ring seal (5) from the fittings.
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Personal injury can result from parts and/or covers under spring
pressure.
Spring force will be released when covers are removed.
Be prepared to hold spring loaded covers as the bolts are loosened.
3. Remove two bolts (6). Install Tooling (A). Remove the remaining two bolts. Remove
Tooling (A). Remove cover (7) from the valve body.
4. Remove O-ring seal (8) and ring (9) from the cover.
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pressure.
5. Remove spring (11) and spool valve (10) from the valve body.
6. Remove plug (12) and the O-ring seal from the valve body.
pressure.
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7. Remove O-ring seal (13) from the plug.
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10. Remove spring (18), guide (17), and spool (16) from the valve body.
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13. Remove relief valve (21) from the valve body.
14. Remove O-ring seals (23), (24), (25), (26), and (28). Remove rings (22) and (27).
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15. Remove pipe plug (29) from the valve body.
16. Remove O-ring seal (30) and O-ring seal (31) from the valve body. Remove plug (32) and
the O-ring seal from the valve body.
Tue Oct 15 09:43:02 UTC+0800 2019
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Product: EXCAVATOR
i02696641
Drift Reduction Valve (Stick) - Assemble
SMCS - 5143-016-JJ
Assembly Procedure
Table 1
Required Tools
A 6V-7981 Bolt M10-1.5 by 70mm 2
B 1U-6396 O-Ring Assembly Compound 1
Note: Cleanliness is an important factor. Before assembly, all parts should be thoroughly cleaned
in cleaning fluid. Allow the parts to air dry. Wiping cloths or rags should not be used to dry parts.
Lint may be deposited on the parts which may cause later trouble. Inspect all parts. If any parts are
worn or damaged, use new parts for replacement. All disassembly and all assembly procedures
must be performed on a clean work surface and in a clean hydraulic area. Keep cleaned parts
covered and protected at all times.
Note: O-rings, gaskets, and seals should always be replaced. A used O-ring seal may not have the
same sealing properties as a new O-ring seal. Use Tooling (A) during the assembly procedure.
Note: Apply a light film of hydraulic oil to all components before assembly.
1/8(W)w

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