John Deere 4045 / 6068 — Manual Belt Tensioner Adjustment
Adjustments · Belt drive
For the John Deere 4045 / 6068, from the John Deere owner's manual.
Applies to: John Deere 4045, John Deere 6068
Before you start
- Do not pry against alternator rear frame.
Procedure
- Install JDG1341 Belt Tension Gauge on belt halfway between pulleys.
- Loosen cap screws.
- Slide alternator or tensioner bracket in slot by hand to remove all excess slack.
- Pry outward on alternator front frame or tensioner bracket until specified tension is achieved.
- Tighten cap screws.
- Run engine for ten minutes and immediately re-check belt tension per used belt specification.
- Reset belt tension as necessary.
Tools required
- JDG1341 Belt Tension Gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- New Belt Tension - 470-650 N (105-145 lb-force)
- Used Belt Tension - 400-580 N (90-130 lb-force)
Full service-parts list: John Deere 4045 →, John Deere 6068 →
Source: John Deere owner'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.