John Deere — Belt Replacement (Series PM9400 Models)
Repair & overhaul · Belt / idler pulley
From a John Deere service manual — check it applies to your exact model before use.
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Procedure
- Remove the Safety Shield.
- Place a 15/16" socket onto the head of the Idler Arm Bolt and apply tension in a counterclockwise direction.
- Slip the Belt off of the Large Pulley.
- Wrap the new Belt around the Small Pulley and on the inside of the Idler Pulley.
- Place a 15/16" socket onto the head of the Idler Arm Bolt and apply tension in a counterclockwise direction.
- Slip the Belt around the Large Pulley, insuring the grooves on the Pulleys match the grooves on the Belt.
Tools required
- 15/16" socket Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: John Deere 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.