Allmand — 2-Way/2-Position Valve Does Not Shift
Testing & diagnosis · 2-way/2-position normally closed valve
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 valve.
- Check for low voltage.
- Check solenoid coil.
- Check for dirt in valve cartridge: energize valve without starting motor and listen for click.
- If no shift, remove cartridge from valve body and blow compressed air through cartridge in both directions while holding plunger off seat.
- Check for bent valve stem; replace valve.
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.