Caterpillar cat 301.7 d mini hydraulic excavator (prefix lj4) service repair manual (lj400001 and up)

Service Repair Manual
Models
301.7D Mini Hydraulic Excavator

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Product: MINI HYD EXCAVATOR
Model: 301.7D MINI HYD EXCAVATOR LJ4
Configuration: 301.7D Mini Hydraulic Excavator LJ400001-UP (MACHINE)
Disassembly and Assembly
301.7D, 302.2D and 302.4D Mini Hydraulic Excavators
Media Number -UENR3253-01 Publication Date -01/05/2015 Date Updated -12/05/2015
i05230329
Engine - Remove and Install
SMCS - 1000-010
Removal Procedure
Start By:
A. Remove cab.
B. Relocate trim.
C. Remove the counterweight.
D. Remove the muffler.
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.
1. Drain Coolant. Refer to Operations and Maintenance Manual, "Cooling System Coolant
(ELC) - Change" for the correct draining and filling procedures.
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Illustration 1 g03333975
2. Remove hose assembly (1). Remove fan guard assembly (2) .
3. Remove hose assembly (3) .
4. Disconnect harness assemblies (4) .
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5. Loosen bolt (5). Loosen tension on belt (6) .
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6. Loosen lower radiator mounting bolts (7). Tilt radiator (8) backwards in order to remove fan
(9). Remove fan (9) .
7. Disconnect harness assembly (10) .
8. Disconnect ground strap (11). Remove mounting bolts (12) .
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9. Use a suitable lifting device to remove engine (13). The weight of engine (13) is
approximately 122 kg (270 lb).
Installation
1. Install engine (13) in the reverse order of removal.
2. Tighten bolts (12) to a torque of 65 N·m (48 lb ft). Tighten bolts (13) to a torque of 45 N·m
(33lb ft). Tighten bolts (14) to a torque of 25 N·m (18 lb ft)
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Mon Mar 9 22:46:41 UTC+0800 2020
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301.7D, 302.2D and 302.4D Mini Hydraulic Excavators
i05212950
Flywheel - Remove and Install
SMCS - 1156-010
Removal Procedure
Start By:
A. Remove the pump drive coupling.
1. Remove bolts (1). Remove flywheel (2).
Installation Procedure
1. Install flywheel (2) in the reverse order of removal.
2. Tighten bolts (1) to a torque of 84 N·m (62 lb ft)
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301.7D, 302.2D and 302.4D Mini Hydraulic Excavators Machine Systems
i05228978
System Pressure - Release
SMCS - 4350-553-PX; 5050-553-PX; 6700-553-PX
Release Procedure (Hydraulic System Pressure)
Personal injury can result from hydraulic oil pressure and hot oil.
Hydraulic oil pressure can remain in the hydraulic system after the
engine has been stopped. Serious injury can be caused if this pressure is
not released before any service is done on the hydraulic system.
Make sure all of the attachments have been lowered, oil is cool before
removing any components or lines. Remove the oil filler cap only when
the engine is stopped, and the filler cap is cool enough to touch with
your bare hand.
1. Lower the work tools to the ground.
2. Turn the engine start switch to the OFF position.
3. Turn the key to the ON position without starting the machine.
4. Move the joysticks through the full range of travel, releasing any pressure that may be
present in the hydraulic system.
5. Push the auxiliary circuit control in both directions, releasing any pressure that may be
present in the auxiliary system.
6. Turn the key to the OFF position.
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7. The pressure in the hydraulic system has now been released. Hydraulic lines and
components can now be removed.
Mon Mar 9 22:48:57 UTC+0800 2020
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i05221871
Blade Cylinder - Remove and Install - Long
SMCS - 7562-010-BG
Specifications
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Table 1
Specification for 395-1281 Hydraulic Cylinder Gp
Item Qty
Part Specification Description
1 1 -
Before assembly, lubricated the threads with clean oil.
Tighten the head to 300 to 350 N·m (221 to 258 lb ft).
2 1 -
Before assembly, apply Locktite 638 to the outer surface of
the bearing.
3 1
395-1286 Piston
Rod
Diameter is
35 mm (1.4 inch).
4 2
395-1218 Bushing Bore after assembly is
32 mm (1.3 inch).
5 1
395-1256 Cylinder
As
Bore is
60 mm (2.4 inch).
6 1 -
Left Hand Thread
Tighten the nut to
10 to 20 N·m (89 to 177 lb in).
Bend the collar of the piston at two places on the flat sides
of the nut.
7 1 -
Tighten the piston to
25 to 35 N·m (221 to 310 lb in).
- - -
Stroke length is
140.0 ± 1.5 mm (5.51 ± 0.06 inch).
Specifications
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Table 2
Specification for 395-1267 Blade Cylinder Gp
Item Qty
Part Specification Description
1 1 -
Before assembly, apply Locktite 638 to the outer surface of
the bearing.
2 1 -
Tighten the head to
300 to 350 N·m (221 to 258 lb ft).
3 1 -
Tighten the piston to
25 to 35 N·m (221 to 310 lb in).
4 1 -
Left-hand thread
Tighten the nut to
10 to 20 N·m (89 to 177 lb in).
Bend the collar of the piston at two places on the flat sides
of the nut.
A 1
395-1255 Cylinder
As
Bore is
70 mm (2.6 inch).
B 1
395-1287 Piston
Rod
Diameter is
40 mm (1.6 inch).
C 2
395-1218 Bushing Bore after assembly is
32 mm (1.3 inch).
- - -
Stroke length is
140.0 ± 1.5 mm (5.51 ± 0.06 inch).
Removal Procedure
Start By:
A. Release the hydraulic system pressure.
Cylinders equipped with lock valves can remain pressurized for very
long periods of time, even with the hoses removed.
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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.
1. Remove cover (1).
2. Disconnect hose assemblies (2). Remove pins (3). Remove blade cylinder (4) .
1. Install blade cylinder (4) in the reverse order of removal.
Mon Mar 9 22:49:54 UTC+0800 2020
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i05181955
Blade - Remove and Install
SMCS - 6060-010
Removal Procedure
1. Remove pin (1) .
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2. Install suitable cribbing under blade arm (2) .
3. Remove pins (3) from blade arm (2) .
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4. Attach a suitable lifting device to blade (4). The weight of blade (4) is approximately 77 kg
(170 lb). Remove blade (4) .
1. Install blade (4) in the reverse order of removal.
Mon Mar 9 22:50:50 UTC+0800 2020
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i05172079
Bucket - Remove and Install
SMCS - 6001-010; 6101-010
Removal Procedure
1. Make sure that the bucket is setting flat with the stick in a vertical position.
2. Remove pins (1) and Lift stick (2) in order to remove bucket (3) .
1. Install bucket (3) in the reverse order of the removal.
Mon Mar 9 22:51:47 UTC+0800 2020
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i05226011
Bucket Linkage - Remove and Install
SMCS - 6513-010
Specifications
Table 1
Specification for 417-7566 Bucket Linkage Gp
Item Qty Part Specification Description
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1 1 229-9247 Pin As Diameter is
29.945 to 29.960 mm (1.1789 to 1.1795 inch).
2 1 Bushing
Bore after assembly is
30 mm (1.2 inch).
3 1 Bushing
Bore after assembly is
32 mm (1.3 inch).
Removal Procedure
Start By:
A. Remove the bucket.
1. Position the stick in a level position on suitable blocking and retract the bucket cylinder.
2. Release the hydraulic system pressure. Refer to Disassembly and Assembly, "Hydraulic
System Pressure - Release".
3. Remove fasteners (1) and the pins. Remove bucket linkage (2)
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4. Remove bearings (3).
5. Remove bearings (4).
Table 2
Required Tools
Tool Part Number Part Description Qty
A
FT-3038 Puller Adapter 1
FT-3039 Receiving Sleeve 1
6V-3160 Single Acting Cylinder 1
1U-7519 Electric Hydraulic Pump 1
4C-9633 Puller Stud 1
9U-6833 Nut 1
126-8928 Hard Washer
When you are using hydraulic cylinders and puller studs, always ensure
that the rated capacity of the puller stud meets or exceeds the rated
capacity of the hydraulic cylinder. If the puller stud does not meet or
exceed the rated capacity of the hydraulic cylinder, a sudden failure of
the puller stud could occur. The sudden failure of the puller stud could
result in personal injury or death.
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Caterpillar cat 301.7 d mini hydraulic excavator (prefix lj4) service repair manual (lj400001 and up)

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