Case CX33C Mini Excavator Repair Manual

Manuals: Service Manual
Introduction
Engine
Hydraulics System
Frames and Ballasting
Tracks and Track Suspension
Electrical System
Booms, dippers and buckets
Dozer Blade and Arm
Platform, cab, bodywork and decals
Special Tools Index
Electrical Schematic
Hydraulic Schematic
Manual Extract: Fuel injectors – Disassemble
1. Clean carbon from used injectors using clean diesel fuel. Hardened deposits or varnish can be cleaned using a brass wire brush.
NOTE: never use a steel wire brush to clean fuel injectors.
Damage to the nozzle and other components is likely to result.
1. Fuel return passage
2. Injector identification location 3. Injector body
4. Pressure adjusting shims
5. Spring
6. Spring seat
7. Valve stop spacer
8. Nozzle valve
9. Nozzle body
10. Nozzle case nut
2. Place the fuel injector in a soft-jawed vise with the nozzle pointing up.
3. Remove the nozzle case nut.
4. Carefully remove the injector from the vise.
5. Turn the injector over and remove the nozzle body, nozzle valve, valve stop spacer, nozzle spring seat, nozzle spring, and shims.

6. Inspect the sealing surfaces (2) between the valve stop spacer and nozzle body for nicks or scratches. Check the contact area between the valve stop spacer and the nozzle valve (1) for scoring, or pitting. Use a magnifier glass to inspect the area.

7. Perform a nozzle valve slide test: 1. Wash nozzle body and valve in clean diesel fuel.
2. While holding the nozzle body vertical, pull the nozzle valve about 2/3 of the way out.
3. Release the valve. It should fall smoothly to its seat by it’s own weight.
8. Replace the fuel injector assembly if it fails any inspection.