TM 3-4230-218-30&P
2-3. TROBLESHOOTING TABLE - Continued.
Table 2-1.
Direct Support Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
11.
LOW WATER PRESSURE - Continued.
Step 1.
Check for leakage at water pump shaft drains - Continued.
d.
Set up and run unit with open hoses. Observe flow.
e
Throttle unit down until clutch disengages and install jets
(wands). Advance throttle and adjust WATER PRESSURE
REGULATOR valve to 100 psi.
f.
If unable to obtain 100 psi, verify proper installation of suction
hose, gaskets, filter, and strainer.
g.
If still unable to obtain 100 psi, pump is defective and should
be replaced (refer to page 2-13).
If water pump is not defective, proceed to step 2.
Step 2.
a.
b.
c.
Check for defective or leaking control panel WATER PRESSURE
REGULATOR valve.
If valve is leaking remove handle and carefully tighten packing
nut . Reinstall handle.
Start unit, install all accessories and check for leaks.
If valve continues to leak, replace water pump (refer to page
2-13).
NOTE
Valve is operative unless valve stem is broken or setscrews from handle do not
grip stem properly.
d.
Verify that movement of handle affects system water pressure.
If pressure is not affected, stem is broken and water pump should
be replaced.
If WATER PRESSURE REGULATOR valve is not defective, proceed to
step 3.
2-8
