Table 4-2. Troubleshooting (Cont)
TEST OR INSPECTION
5. Pressure Control Shuts Off Prematurely or Too Late
Check pilot valve adjustment.
Adjust pilot valve (para 4-22).
6. Cycling Valve: No Response to Fill or Stop Buttons.
Step 1. Inspect for damaged cycling valve preformed packings.
Install serviceable cycling valve preformed packings (para 4-21).
Step 2. Inspect for damaged cycling valve compression ring.
Install serviceable cycling valve compression ring (para 4-21).
Step 3. Inspect for dirty cycling valve.
Clean dirty cycling valve (para 4-21 b).
7. Hose Assembly Coupling Halves Leak.
Step 1. Inspect for damaged or missing coupling half gaskets.
Install serviceable coupling half gaskets (para 4-24 and 4-25).
Step 2. Inspect for cracked coupling half.
Install a serviceable coupling half (para 4-24 and 4-25).
8. Hose Leaks.
Inspect for cut or cracked hose.
Replace or repair hose assembly.
Section VI. MAINTENANCE OF DRUM ASSEMBLY
4-14. Coupler Valve Assembly.
a. Removal. Stop the pump assembly and pro-
ceed as follows:
(1) Turn handwheel (fig. 4-2) clockwise to close
(2) Disconnect hose assembly from coupler
(3) Disconnect coupler valve assembly from
check valve assembly adapter.
Install the dust cap on the check valve
(1) Unscrew and remove nut (1, fig. 4-6) and
handwheel (2) from stem (4).
(2) Unscrew and remove handwheel retainer (3)
from the coupler valve body (14).
(3) Remove valve stem (4) from the coupler
valve assembly. Pry damaged preformed packing
(5) from valve stem.
(4) Remove retaining ring (6), spacer (7), and
valve stem rotor (8).
(5) Remove valve stem (9) and seat ring (10). If
damaged, remove pin (12) from valve stem.
(1) Using a pointed instrument, remove a
damaged gasket (11 and 13, fig. 4-6) from the
coupler valve assembly. Using a blunt instrument,
install serviceable gaskets in the coupler valve