Allmand — M-640 Series Port Filter Cleaning
Maintenance · Port filters (M-640 Series)
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
- If ports C1 and C2 are not used, remove flush 1/4 inch pipe plugs.
- If ports C1 and C2 are used, remove the hoses.
- Reach down into ports with a 1/4 inch allen key and remove filter retainer screws.
- Remove filters and clean or replace as necessary.
- Reassemble in reverse order.
Tools required
- 1/4 inch allen key Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.