Case CX220C Series 2 Crawler Excavator Service Manual

Description

Table of Contents

1. Content
2. Introduction
3. Engine
4. Hydraulics System
5. Frames and Ballasting
6. Tracks and Track Suspension
7. Cab Climate Control
8. Electrical System
9. Booms, dippers and buckets
10. Platform, cab, bodywork and decals
11. Special Tools Index

Manual Extract: Stacked control valves – Inspect

Inspect all surfaces of each part for burrs, scratches, gouges, and other defects.

1. Inspect the valve housing load check seat surface for scratches, gouges, and also for debris, dents, rust. Repair any minor scratches with an oilstone.
2. Check that there are no scratches, dents, etc. on the outer edge of the spool. Repair any small scratches with an oilstone.
3. Sliding parts must all move easily. Also, all grooves and paths must be free of foreign matter.
4. If a spring is broken or extremely deformed or worn, replace it.
5. If relief valve operation is poor, inspect according to “Troubles and countermeasures relief valve”.
6. Replace all O-rings and backup rings from disassembled parts.
7. After removing caps or plugs, check for any paint fragments around the body opening or plug seating surface.
(If paint fragments were to get inside the valve, they could jam up or clog up the valve,