Service Repair Manual
Models
303 CR Mini Hydraulic
Excavator
Product: MINI HYD EXCAVATOR
Model: 303 MINI HYD EXCAVATOR DMA
Configuration: 303 CR Mini Hydraulic Excavator DMA00001-UP (MACHINE) POWERED BY S3L2 Engine
Disassembly and Assembly
303 CR Mini Hydraulic Excavator Machine Systems
Media Number -RENR5593-01
Publication Date -01/01/2004
Date Updated -13/01/2004
i01920827
Main Control Valve - Assemble
SMCS - 5051-016
Assembly Procedure
NOTICE
Failure to properly assemble parts or failure to follow established
procedures can lead to damage of the parts and assembly.
To avoid damage to parts, always identify and mark the parts so that
they can be installed in the same location. Ensure that gear surfaces
align. Never force parts during assembly.
Spring force can cause personal injury or death.
Do not repair until you have read the Operation and Maintenance
Manual.
Note: Only a small number of components within the main control valve are serviced
components. A large number of nonserviceable items must be disassembled in order to access the
serviced components.
Note: Keep all of the internal parts of the main control valve clean and lubricated.
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1. Cleanliness is an important factor. Before the disassembly procedure, the exterior of the
component should be thoroughly cleaned. This will help prevent dirt from entering the
internal mechanism.
Illustration 1
g00999509
Illustration 2
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(A) Bucket Block Assembly
(B) Boom II Block Assembly
(C) Boom Block Assembly
(D) Left Travel Block Assembly
(E) Straight Travel Block Assembly
(F) Right Travel Block Assembly
(G) Stick (Arm) Block Assembly
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(H) Auxililiary (PTO) Block Assembly
(I) Boom Up Block Assembly
(J) S