Initial Inspection and Diagnostic Overview

1. Ensure fluid level and drive belt tension are proper. Disconnect pressure hose and cap, then connect a spare pressure hose to pump fitting.
2. Connect spare pressure hose to gauge side of tool No. C-3309-E, or equivalent, then the pressure hose from gear valve to valve side of tool Nos. L-4601 and C-3309-E, or their equivalents. New fittings will be required on tool No. C-3309-E, or equivalent, to adapt to new O-ring type hose tube ends.
3. Open hand valve on special tool, then insert a thermometer into fluid reservoir.
4. Start engine and allow fluid to reach a temperature of 150-170°F.
5. Turn wheels from stop to stop to aid in warming fluid. Do not hold wheels against stop for an extended period. Internal pump overheating may result.
6. With engine at idle speed and gauge valve open, inspect initial pressure. Results should be as specified under "Power Steering Pressure Specifications."
7. If pressure is in excess of 100 psi, inspect hoses for restrictions and/or crimped oil lines.
8. Close gauge valve completely three times and record highest pressure attained each time. Do not leave valve closed for more than five seconds or pump could be damaged.
9. If recorded pressures are within specifications and range of readings are within 50 psi, pump is operating properly.
10. If recorded pressures are high, but do not repeat within 50 psi, flow control valve in pump is sticking. Remove valve, clean and remove any burrs with crocus cloth. If system contains some dirt, it must be thoroughly flushed. If it is exceptionally dirty, both pump and gear must be removed, completely disassembled, cleaned and reassembled before further usage.
11. If recorded pressures are constant, but less than minimum specification, clean or replace pressure relief valve assembly. If pressures are still low, repair or replace pump.
12. If pump is within specifications, leave gauge valve open and turn steering wheel from stop to stop with engine idling. Record highest pressures attained at each wheel stop and compare with maximum pump pressure recorded previously. If this pressure cannot be obtained in either side of gear, the gear is leaking internally and must be disassembled and repaired.
13. Turn engine Off, then remove tool No. C-3309-E, or equivalent.
14. Connect pressure hose, then perform repairs as necessary.