Allmand — M-670/680/690 Series Port Filter Cleaning
Maintenance · Port filters (M-670, M-680, M-690 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
- Remove hoses from valve body.
- Remove filter retainer screws with a 1/4 inch allen key.
- Remove and clean or replace filters as required.
- 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.