Table 3-2. Troubleshooting - CONT
TEST OR INSPECTION
PROPELLER SHAFT ASSEMBLY
EXPANDER TUBE BRAKE - CONT
Clean friction shoe linings. Refer to paragraph 3-204 .
STEP 4. Inspect rubber actuator tube for hardening or swollen spots.
Replace rubber actuator tube. Refer to paragraph 3-204 .
62. Shaft brake slips when locked.
STEP 1. Check for oil or grease on friction shoes.
POTABLE WATER PIPING SYSTEM
63. Low discharge pressure.
STEP 1. Check for leaking pipes and fitting.
Reseal or replace pipes and welded fittings (para. 3-83).
STEP 2. Check for defective pressure tank.
a. Inspect for leaks at weld joints, excessive corrosion, security, and general condition of tank.
b. Replace or repair tank as necessary (para. 3-83).
STEP 3. Check or defective pump.
a. Excessive impeller running clearance.
Do not allow pump to operate with insufficient impeller clearance.
Adjust impeller clearance (para. 3-109).
If adjustment does not restore desired performance. Replace the impeller and raceway
as necessary (para. 3-109).
The impeller and raceway are matching parts and must be replaced as a set.
b. Excessive vibration.
(1) Bent shaft or badly worn bearings. Repair pump (para. 3-109).