TM 10-4610-310-14
UNIT MAINTENANCE
LIGHTWEIGHT WATER PURIFIER
TROUBLESHOOTING PROCEDURES
DIESEL ENGINE AIR SHUTOFF
GENERAL
This work package lists the common malfunctions that you may find during the operation or maintenance of the
Lightweight Water Purifier (LWP) air shutoff assembly on the high-pressure pump module. You should perform
the tests/inspections and corrective action in the order listed. This valve is solenoid driven to close off the air
supply to the diesel engine when activated by high pressure.
This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If a
malfunction is not listed or is not corrected by listed corrective actions, notify your supervisor.
WARNING
When checking for voltage on an energized component, extreme care must be taken. Only qualified and
authorized electrician should maintain, troubleshoot, and operate energized equipment. Injury or death to
personnel may result.
MALFUNCTION
TEST/INSPECTION
CORRECTIVE ACTION
1. Undirected shutdown
Reset the control panel and
If the engine shutsdown again proceed
restart the unit
to next step.
Inspect for loose connections
Tighten loose connections
Inspect for air leaks: spray the
Repair or replace leaking component.
shutdown assembly with soapy
water and check for bubbles.
2. Alarm light is blinking at
Ensure that the UF filtrate tank
If full, troubleshoot low level switch. WP
control module
is full
3. Alarm light is on at control
Ensure that the RO pressure did
Open the reject valve
module
not exceed 1200 psi
Troubleshoot high pressure
See WP 0067 00.
switch
4. Engine shuts down slowly
Remove air cleaner assembly
Replace damaged or missing parts. WP
and inspect butterfly valve for
damage or missing screws
through which air can be drawn.
Inspect the vent plug (WP 0093
Clean the vent plug if clogged. WP 0093
5. solenoid valve is not
Ensure filtrate tank is full and RO
Tighten ground or neutral wires.
functioning (not allowing the
reject valve is opened. Ensure all
pressureized air to enter the air
components have continuity to
cylinder)
ground
Measure voltage (120 VAC)
If present, replace solenoid valve, if not
across wires 3 and 28 at the
proceed to the next step.
solenoid switch
Measure voltage (120 VAC)
If present, replace HP module cable, if
across pins (B) and (E) at the
not proceed to next step.
control module
0066 00-1
