Caterpillar C-3406B / C-346 — Control Valve Maintenance
Maintenance
For the Caterpillar C-3406B / C-346, from the Caterpillar service manual.
Browse Caterpillar generators & specs →
Before you start
- Control valve covers are under load from the control valve springs; remove with care to avoid personal injury.
Procedure
- Remove capscrews and covers from the top of the brake housing.
- Carefully remove the control valve springs.
- Using needle-nose pliers, reach into the bore, grasp the stem of the control valve and pull it straight up and out of its bore.
- Wash the control valves with approved cleaning solvent; push a wire through the hole in the base to ensure the ball check is free.
- Replace the control valve if the ball is stuck; dry with compressed air and wipe clean with a paper towel.
- Dip the control valve in clean lube oil and let it drop into its bore; replace the control valve if binding occurs.
Tools required
- Needle-nose pliers Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.