Service Repair Manual
Models
303.5E2 Mini Hydraulic
Excavator
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Product: MINI HYD EXCAVATOR
Model: 303.5E2 MINI HYD EXCAVATOR JWY
Configuration: 303.5E2 Mini Hydraulic Excavator JWY00001-UP (MACHINE) POWERED BY C1.7 Engine
Disassembly and Assembly
C1.7, C1.8 and C2.4 Tier 4 Interim and EU Stage 3A Engines for Caterpillar Built
Machines
Media Number -UENR0128-11
Publication Date -01/08/2015
Date Updated -09/06/2016
i05243403
Inlet and Exhaust Valve Springs - Remove and Install
SMCS - 1108-010
Removal Procedure
Table 1
Required Tools
Tool Part Number
Part Description
Qty
A
7F-4292
Valve Spring Compressor
1
9U-6144
Adapter
1
Start By:
a. Remove the rocker shaft and push rod.
NOTICE
Keep all parts clean from contaminants.
Contaminants may cause rapid wear and shortened component life.
Note: The following procedure should be adopted in order to remove the valve springs when the
cylinder head is installed to the engine. Refer to Disassembly and Assembly, "Inlet and Exhaust
Valves - Remove and Install" for the procedure to remove the valve springs from a cylinder head
that has been removed from the engine.
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Note: Ensure that the appropriate piston is at top dead center before the valve spring is removed.
Failure to ensure that the piston is at top dead center may allow the valve to drop into the cylinder
bore.
Illustration 1
g02725096
Illustration 2
g02725099
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.
NOTICE
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Ensure that the valve spring is c