Hercules — 500 Hour or 12,000 Mile Maintenance
Maintenance · engine
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
Before you start
- Fuel nozzle and holder assemblies should only be disassembled, cleaned, and adjusted by a competent fuel system technician.
Procedure
- Repeat daily, 50-hour, and 100-hour maintenance.
- Check cooling system hoses; replace if necessary.
- Check fuel nozzles; check opening pressure.
- Drain fuel tank of water and sediment.
- Check battery; clean and check specific gravity.
- Inspect alternator; replace worn brushes.
- Perform engine tuneup as required by engine performance.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Fuel nozzle nominal opening pressure 2750 psi; new assemblies set at 2900 psi.
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.