Caterpillar C-3406B / C-346 — Solenoid Valve Maintenance
Maintenance
For the Caterpillar C-3406B / C-346, from the Caterpillar service manual.
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Before you start
- Do not readjust or tamper with the solenoid valve; engine damage could result.
Procedure
- Disconnect the solenoid harness.
- Unscrew the solenoid valve with a Jacobs solenoid socket or a 12 pt. socket wrench.
- Remove and discard the three rubber seal rings; remove the lower ring with a seal pick if it stays in the bore.
- Wash out the solenoid valve with approved cleaning solvent; clean the oil screen with a brush and dry with compressed air.
- Clean the solenoid valve bore in the housing with clean paper towels; never use rags.
- Reinstall the solenoid using new seal rings; seat the lower seal ring in the base of the bore and wipe clean lube oil around the bore.
- Place the upper and center seal rings on the solenoid valve body and carefully screw the solenoid into the housing.
- Torque the valve to 5 lbft (7 N·m); be careful not to twist the seals.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Solenoid valve torque 5 lbft (7 N·m)
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.