Table 3-2. TROUBLESHOOTING PROCEDURES
TEST OR INSPECTION
PUMP NOT DELIVERING OIL
Step 1. Inspect for low oil level in reservoir.
Check oil level, and fill reservoir as necessary
Step 2. Inspect for dirt in pump body.
Disassemble pump body and clean all parts. Refer to Chapter 4, AVIM.
Step 3. Inspect for worn seats and proper seating.
Replace worn seats or reseat seats in casting. Refer to Chapter 4, AVIM.
Step 4 Inspect for overfilled reservoir.
Drain excess oil from reservoir.
PUMP LOSING PRESSURE
Step 1. Inspect for oil leaking past outlet ball seats.
Reseat and/or replace balls and seats. Refer to Chapter 4, AVIM.
Step 2. Inspect for oil leaking past unloading valve piston. Refer to Chapter 4, AVIM.
Replace o-ring on valve unloading piston. Refer to Chapter 4, AVIM.
Step 3. Check for loose connections.
Tighten connections as necessary.
Step 4. Check two-way valve for leaks or correct adjustment.
Reseat/replace ball check; adjust two-way valve handle. Refer to Chapter 4, AVIM.
PUMP DOES NOT REACH FULL PRESSURE
Step 1. Check for low oil level.
Fill reservoir as necessary