Caterpillar Cat 308E2CR Mini Hydraulic Excavator (Prefix TMX) Service Repair Manual (TMX00001 and up).pdf

Service Repair Manual
Models
308E2CR Mini Hydraulic Excavator

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Product: MINI HYD EXCAVATOR
Model: 308E2 CR MINI HYD EXCAVATOR TMX
Configuration: 308E2 CR Mini Hydraulic Excavator TMX00001-UP (MACHINE) POWERED BY C3.3B Engine
Disassembly and Assembly
C3.3B Tier 4 Final and EU Stage 3B Engines for Caterpillar Built Machines
Media Number -UENR3278-07 Publication Date -01/09/2014 Date Updated -11/07/2016
i05306703
Crankshaft Front Seal - Remove and Install
SMCS - 1160-010
Removal Procedure
Start By:
a. Remove the crankshaft pulley.
Note: Refer to Specifications, "Engine Design" for non-specified engine torque values.
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.
Dispose of all fluids according to local regulations and mandates.
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308E2 CR Mini Hydraulic Excavator TMX00001-UP (MACHINE) POWERED BY C...
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Illustration 1 g02795123
1. Use a suitable pry bar to remove crankshaft front seal (1).
Installation Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 390-1140 Driver 1
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1. Position crankshaft front seal (1) on Tooling (A). Install crankshaft front seal (1) on the
crankshaft.
End By:
a. Install the crankshaft pulley.
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Tue Jan 7 23:45:10 UTC+0800 2020
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i05306714
Idler Gear - Remove and Install
SMCS - 1206
Removal Procedure
Table 1
Required Tools
A 390-1135 Idler Gear Tool 1
Start By:
a. Remove the rear housing.
NOTICE
Keep all parts clean from contaminants.
Contaminants may cause rapid wear and shortened component life.
NOTICE
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containing fluids.
Alignment of timing marks
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1. Find top dead center for number 4 piston. Refer to Testing and Adjusting, "Finding Top
Center for No. 4 Piston".
2. Ensure that Timing Marks (X) on the camshaft gear and the crankshaft gear are aligned.
Refer to Illustration 1.
3. Ensure that Timing Marks (Y) on the idler gear and the camshaft gear are aligned. Refer to
Illustration 2.
4. Ensure that Timing Marks (Z) on the idler gear and the fuel injection pump gear are aligned.
Refer to Illustration 3.
5. Remove bolts (2), washer (3), and the idler shaft from idler gear (1). Remove idler gear (1)
and the washer.
6. Use Tooling (A) to remove idler gear bearing (4) from idler gear (1).
1. Install idler gear (1) in the reverse order of removal.
a. Tighten bolts (2) to a torque of 49 to 55 N·m (36 to 41 lb ft).
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b. Ensure that the gears, cylinder block surface, and idler gear (1) are clean and free
from wear or damage. If necessary, replace any components that are worn or
damaged.
c. Lubricate idler gear bearing surface (4) with clean engine oil.
d. Check oil clearance between the idler gear shaft and the idler gear bushing. Refer to
Specifications, "Gear Group (Front)" for allowable clearance.
e. Check the idler gear shaft outer diameter and the inner diameter for the idler gear
bushing.
Tue Jan 7 23:46:07 UTC+0800 2020
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i05306965
Housing (Front) - Remove and Install
SMCS - 1151-010
Removal Procedure
Table 1
Required Tools
A - Three Bond 1217H 1
Start By:
a. Remove the crankshaft front seal.
NOTICE
NOTICE
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containing fluids.
1. Drain the coolant from the cooling system into a suitable container for storage or disposal.
2. Disconnect hose assemblies (1) and (2) from the oil cooler.
3. Remove bolts (4).
4. Remove front housing (3) and the gasket.
NOTICE
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1. Ensure that the front housing is clean and free from damage. If necessary, replace the front
housing.
2. Clean all the gasket surfaces of the cylinder block.
3. Apply Tooling A to the seam between the lower crankcase section (6) and the upper
crankcase section (5).
4. Align a new gasket and install the gasket to the cylinder block.
5. Tighten 13 bolts (4) in a side to side sequence. Tighten bolts (4) to a torque of 24 to 27 N·m
(212 to 239 lb in)
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6. Connect hose assemblies (1) and (2) to the oil cooler.
7. Fill the cooling system with coolant. Refer to Operation and Maintenance Manual, "Cooling
System Coolant (ELC) - Change" for the correct draining and filling procedures.
End By:
a. Install the crankshaft front seal.
Tue Jan 7 23:47:03 UTC+0800 2020
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i05228712
Valve Mechanism Cover - Remove and Install
SMCS - 1107-010
Removal Procedure
Start By:
a. Remove the glow plugs.
b. Remove the fuel injection lines.
Note: Refer to Specification UENR3421 "Engine Design" for non-specified engine Torque
Values.
1. Remove bolts (1) to remove brackets.
2. Disconnect hose assemblies (2) and (3).
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3. Remove bolts (4).
4. Remove valve mechanism cover (5).
5. If necessary, remove O-ring seal in valve mechanism cover (5) and replace with new.
1. Install valve mechanism cover (5) in the reverse order of removal.
a. Tighten bolts (4) to a torque of 10 to 11 N·m (87 to 100 lb in).
Tue Jan 7 23:48:00 UTC+0800 2020
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i05223576
Bridge Dowels - Remove and Install
SMCS - 1100-010
Removal Procedure
Table 1
Required Tools
A 5P-0944 Dowel Puller Gp 1
Start By:
a. Remove valve springs.
Values.
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1. Install Tooling (A) and remove bridge dowel (1).
Table 2
Required Tools
B 390-1142 Spacer 1
1. Use a press or hammer to drive bridge dowel (1) to a height that is flush with Tooling (B).
End By:
a. Install valve springs.
Tue Jan 7 23:48:57 UTC+0800 2020
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i05221855
Rocker Shaft and Push Rod - Remove and Install
SMCS - 1102-010; 1208-010
Removal Procedure
Start By:
a. Remove valve mechanism cover.
Values.
1. Remove bolts (3) and tube assembly (4).
2. Remove nuts (2) and brackets (1).
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3. Remove bolts (5) from rocker shaft assembly (6).
4. Remove rocker shaft assembly (6) from cylinder head (9).
5. Place an identification mark on pushrods (8) in order to show the location. Remove
pushrods (8) from cylinder head (9).
Note: Identification will ensure that the pushrods can be reinstalled in the original positions.
Do not interchange the positions of used pushrods.
6. Remove valve bridge arms (7).
1. Install rocker shaft assembly (6) and pushrods (8) in the reverse order of removal.
a. Install bolts (5) and tighten to a torque of 49 to 55 N·m (37 to 41 lb ft).
b. Position brackets (1) and install nuts (2). Tighten nuts (2) to a torque of 24 to 27 N·m
(18 to 20 lb ft) .
2. Position tube assembly (4) and install bolts (3). Tighten bolts (3) to a torque of
9.8 to 11.2 N·m (87 to 100 lb in).
3. Adjust the inlet valve lash and the exhaust valve lash to 0.13 to 0.17 mm
(0.005 to 0.007 inch). Refer to Testing and Adjusting, "Engine Valve Lash -
Inspect/Adjust".
Tue Jan 7 23:49:54 UTC+0800 2020
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i05307420
Rocker Shaft - Disassemble
SMCS - 1102-015
Disassembly Procedure
Start By:
a. Remove the rocker shaft and pushrods.
Personal injury can result from being struck by parts propelled by a
released spring force.
Make sure to wear all necessary protective equipment.
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Caterpillar Cat 308E2CR Mini Hydraulic Excavator (Prefix TMX) Service Repair Manual (TMX00001 and up).pdf

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