John Deere — Pump Housing Disassembly (All Models)
Repair & overhaul · Pump casing / impeller
From a John Deere service manual — check it applies to your exact model before use.
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Before you start
- Always flush pump with water or neutralizing agent before servicing.
- O-ring should always be replaced.
Procedure
- Remove the four Casing Cap Screws with a 9/16" box end wrench; tap the Pump Casing on discharge port to break it loose.
- Check inside of Pump Casing including suction port; replace if badly eroded or damaged. Remove O-ring and discard.
- To remove the Impeller Nut, clamp the Flange in a vise and insert a large screwdriver or file into the Impeller Vanes.
- Use a socket wrench (3/4" for Series PM9000CO or 5/8" for Series PM9200C and PM9400C) to remove the Impeller Nut by turning counterclockwise.
- Once the Nut is removed, pry the Impeller away from the Mounting Flange using a screwdriver on each side.
- Remove Woodruff Key from the Shaft (Series PM9000CO only) and remove O-ring from the Mounting Flange.
Tools required
- 9/16" box end wrench Amazon
- large screwdriver or file (at least 10" [254 mm] long) Amazon
- 3/4" socket wrench Amazon
- 5/8" socket wrench Amazon
- 7/8" deep socket wrench Amazon
- 9/16" deep 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.