Case CX30C Mini Excavator Repair Manual

Manuals: Service Manual

Content

Introduction

Engine

Hydraulics System

Frames and Ballasting

Tracks and Track Suspension

Cab Climate Control

Electrical System

Booms, dippers and buckets

Dozer Blade and Arm

Platform, cab, bodywork and decals

Special Tools Index

Electrical Schematic

Hydraulic Schematic

Manual Extract: Valve lapping

1. Apply compound evenly to the valve lapping surface.

2. Insert the valve into the valve guide. Lap the valve onto its seat with a valve flapper or screwdriver.

3. After lapping the valve, wash the compound away and apply oil, then repeat valve lapping with oil.

4. Apply Prussian blue to the contact surface to check the seated rate. If it is less than 70%, repeat valve lapping again.

NOTE: when valve lapping is performed, be sure to check the valve recessing and adjust the valve clearance after assembling the valve.

Free length and tilt of valve spring

1. Measure the free length (B) of valve spring with vernier calipers. If the measurement is less than the allowable limit, replace it.

2. Put the valve spring on a surface plate, place a square on the side of the valve spring.

3. Check to see if the entire side is in contact with the square. Rotate the valve spring and measure the maximum tilt (A). If the measurement exceeds the allowable limit, replace it.

4. Check the entire surface of the valve spring for scratches. If there is any problem, replace it.

Factory specification – 37.0 – 37.5 mm (1.46 – 1.48 in)

Allowable limit – 36.5 mm (1.44 in)