Allis-Chalmers — Belt Adjustment and Replacement - Series 433, 649 and 670 Engines
Adjustments · Drive belts
From a Allis-Chalmers operator's manual covering: 6138, 685, SERIES 6138, SERIES 670. Check it applies to your exact model before use.
Before you start
- Do not check or adjust belts when engine is running
Procedure
- Stop engine, remove belt guard
- Loosen alternator adjusting brace capscrew and mounting bolt or capscrew
- Install new belt(s) in pulley grooves
- Move alternator away from engine until specified belt tension is achieved
- Tighten brace capscrew and mounting bolt or capscrew
- Reinstall belt guard
Tools required
- Belt tension gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Belt tension per belt width chart (e.g. 1/2 in new 107-114 lb)
Source: Allis-Chalmers operator's 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.