795-93848
11 of 41
12/23/21
TROUBLESHOOTING GUIDE
CONDITION
POSSIBLE CAUSE
CORRECTION
P
ump
Pump does not run
Machine is unplugged
Plug machine into outlet
Circuit breaker is tripped
Check breaker and correct. If
problems persist, contact Graymills.
Pump motor is burned out
Replace pump
Faulty switch
Replace switch
Pump runs but
does not pump fluid
Pump filter screen is
clogged
Clear debris from around pump
Flexible metal hose clogged Clear debris from metal hose
Pump rubber discharge
hose clogged
Clear debris from hose or replace
hose
Pump runs but is
noisy (Some noise
is normal).
Cavitation due to low liquid
level
Raise liquid level to correct level
REPLACEMENT PARTS
DESCRIPTION
GRAYMILLS P/N
DRAWING
REF.
Gas Spring
765-09853
FIGURE 2(F)
Fusible Link 165°F
740-93713
FIGURE 2(G)
Rocker Switch
770-93609
FIGURE 2(Q)
Pump 1/125 HP
390-06940(-A model)
FIGURE 2(T)
Pump 1/150 HP
390-09800(-B model)
Pump Guard
640-44907
FIGURE 2(V)
Neoprene Hose
729-91335
FIGURE 2(U)
Flexible Metal Hose
728-27602
FIGURE 2(M)
Rubber Seal
745-93823
FIGURE 2(P)
Foam Filter Block
742-07095
FIGURE 2(Y)
Filter Basket
645-44865
FIGURE 2(X)
Drain Shelf
645-44902
FIGURE 2(N)
Parts Basket
645-35264
FIGURE 2(O)
