Caterpillar C317 — Control Valve Removal and Cleaning
Maintenance
For the Caterpillar C317, from the Caterpillar service manual.
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Before you start
- Remove control valve covers carefully to avoid personal injury; control valve covers are under load from the control valve springs.
- Be sure the control valve collar is installed with the longer sleeve area up. If the collar is installed upside down, engine damage may result.
Procedure
- Apply pressure on the control valve cover and rotate the retaining ring ears to the slot in the housing; remove retaining ring using retaining ring pliers.
- Slowly remove cover until spring pressure ceases, then remove the two control valve springs, insert, and collar.
- Using needle nose pliers, reach into the bore and grasp the stem of the control valve and remove it.
- Wash the control valves with approved cleaning solvent; push a wire into the hole in the base to ensure the ball check is free.
- Dry the valve with compressed air and wipe clean with a paper towel; thoroughly clean the control valve bore.
- Reassemble parts reversing the removal procedure.
- Rotate the retaining ring so that the ears are located away from the slot in the housing.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Replace control valve if ball check is stuck
Source: Caterpillar service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.