Magnum MTP4000S — Reassembly - Impeller
Repair & overhaul
For the Magnum MTP4000S, from the Magnum operator's manual.
Applies to: John Deere PE4024TF281 engine
Before you start
- Do not use anti-seize compounds on the lockscrew threads
- Do not allow the shaft to rotate while tightening the lockscrew
Procedure
- Ensure the shaft and impeller threads are completely clean before re-installing the impeller.
- Apply anti-seize compound to the external shaft threads.
- Screw the impeller onto the shaft until tight.
- Measure clearance between impeller and rotating assembly; add or remove impeller adjusting shims as required.
- Apply Loctite 2760 or equivalent to the impeller screw and install the impeller washer and screw.
- Torque the impeller screw to a minimum of 175 ft-lb (237 Nm), maximum of 235 ft-lb (118 Nm).
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Impeller to seal plate clearance .025 to .035 in (.63 to .89 mm)
- Impeller screw torque min 175 ft-lb (237 Nm), max 235 ft-lb (118 Nm)
Source: Magnum 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.