John Deere — Seal Replacement/Pump Housing Reassembly
Repair & overhaul · Mechanical seal / impeller / pump casing
From a John Deere service manual — check it applies to your exact model before use.
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Before you start
- Be extremely careful with the new seal; do not scratch the lapped sealing faces of the rotary washer and stationary seat.
- Never run the sealing faces dry.
Procedure
- Lubricate seal cavity in mounting flange with WD-40, LPS or equivalent.
- Install the stationary portion of the mechanical seal by sliding over the shaft with the ceramic side out.
- To seat the Seal in the seal cavity, use a piece of 3/4" PVC pipe 4" to 6" long; press the Seal in firmly and squarely.
- Install the rotary portion of the mechanical seal over the shaft with the carbon side facing in and press until it bottoms out.
- Insert the Key into shaft key slot, place Impeller on the Shaft, put Impeller Nut on shaft end and tighten securely.
- Install O-ring on Mounting Flange; place Pump Casing on the Mounting Flange and tighten the bolts alternately and evenly.
Tools required
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.