Allmand — 3-Way/4-Way Valve Does Not Shift
Testing & diagnosis · 3-way/2-position and 4-way/2-position valves
From a Allmand service manual covering: M-250 Series, M-258, M-259, M-301, M-303, M-304, M-310, M-311, M-313, M-314, M-319, M-326…. Check it applies to your exact model before use.
Procedure
- Check valve hot wire.
- Check valve ground wire.
- Check switch controlling the valves.
- Check for low voltage.
- Check solenoid coil.
- Check for dirt in valve cartridge: energize valve without starting motor and listen for valve shift.
- If not heard, remove cartridge and blow compressed air through all parts to dislodge dirt.
- Clean all parts in solvent, blow dry, and lubricate.
Source: Allmand 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.