Hercules — Oil Pump Removal and Disassembly
Repair & overhaul · lubrication system
From a Hercules service manual covering: D-1500, D-1700, D-2000, D-2300, D-3400, De3000. Check it applies to your exact model before use.
Applies to: Hercules D Series engine
Procedure
- Drain oil and remove oil pan.
- Turn crankshaft so No. 1, 4, or 6 piston is in firing position.
- Remove tachometer drive if equipped.
- Remove two attaching bolts and lock washers from pump flange; pull oil pump from engine.
- Bend up tangs on lock washer; remove regulator assembly and shims.
- Remove oil pump strainer from pump impeller cover.
- Use gear puller to remove drive gear from shaft.
- Remove cover bolts and washers; remove cover.
- Remove impeller and shaft as assembly.
- Remove idler impeller from idler shaft.
Tools required
- Gear puller Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Hercules 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.