WT5C SERIES WATER TRAILER • OPERATION MANUAL — REV. #6 (05/28/21) — PAGE 21
OPERATION
There is an operating mode (Figure 17) that could be
harmful to your water pump. Never operate the water trailer
with the spray bar control handle in the vertical position (rear
spray on), and the manifold control handle in the horizontal
position (suction/left) with the engine running.
This mode of operation with no hoses attached causes the
pump to draw in air creating unnecessary back pressure.
Never operate the water trailer in this mode.
The recommended operating modes of the water trailer
are shown in Table 5.
NOTICE
NEVER
operate the water trailer with the spray bar and
manifold control handles as shown in Figure 17.
This mode of operation with the engine running causes
the pump to draw in air, creating unnecessary back
pressure.
NOTICE
Prior to engine start, the pump
MUST BE
primed. This
is accomplished by removing the Pump Fill Cap and
filling the Pump Casing with water and then re-securing
the fill cap.
Figure 17. Do Not Use Mode (Engine On)
RI
GH
T
RI
GH
T
ENGIN
E
STAR
T
SPRA
YBAR
CONTROL
HANDLE
MANIFOL
D
CONTRO
L
HANDL
E
OFF
ENGINE- ON -
SUCTION
ALLPO
RTS
LE
FT
MANIFOLD
CONTRO
L
HANDL
E
SPRA
YBAR
CONTROL
HANDL
E
ENGINE- ON -
DISCHARG
E
ALLP
ORTS
MANIFO
LD
CONTRO
L
HANDL
E
ENGINE
ON or OF
F
SPRA
YBAR
SPRA
YBAR
CONTRO
L
HANDLE
ON
ON
OFF
SPRA
YBAR
CONTRO
L
HANDLE
MANIFOLD
CONTRO
L
HANDLE
P/N 4
9937
OFF
ENGINE ON
MANIFOLD
CONTROL HANDLE
SPRAY BAR
CONTROL HANDLE
DRAWING
AIR IN ONLY
DRAWING
AIR IN ONLY