Detroit Diesel — Purge the Hydrostarter System
Maintenance · Hydrostarter hydraulic starting system
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- The oil pressure in the system must be released prior to servicing the Hydrostarter motor or other components to prevent possible injury to personnel or equipment.
Procedure
- Loosen the lock nut and rotate the by-pass valve on the hand pump inlet one turn counterclockwise.
- Operate the hand pump for 12 to 15 complete strokes; do not pump too rapidly.
- Close the by-pass valve tightly and tighten the lock nut.
- Engage the starter pinion and operate the hand pump until the starter has turned several revolutions; close the control valve.
- Loosen the swivel hose fitting at the engine-driven pump discharge about two turns and operate the hand pump until oil appears; tighten the fitting.
- Run the engine at least 1500 rpm and purge the engine-driven pump of air; tighten the fitting when oil is free of bubbles.
- Examine all high pressure hoses, connections and fittings for leaks.
- Fill the reservoir to the proper level.
Specs & values
- Accumulator precharge pressure 1250 psi (10 413 kPa) at 70F (21C)
- System pressure 2900 to 3300 psi (19 981 to 22 737 kPa)
Source: Detroit Diesel 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.