NMC-WOLLARD 2021Truax Blvd., Eau Claire, WI 54703, Phone (715) 835-3151, Fax (715) 835-6625
M100 Tow Tractor Manual No. 46052
PAGE 52
CHAPTER 2 MAINTENANCE
1 SERVICING
4. Safety Relief Valve, which valve opens automatically when tank pressure rises
above 275 PSI, and closes when excess pressure is reduced.
Principle of Operation and General Information
1.
valve on the vaporizer unit. A relief valve is installed in the LPG system to
closes when the excess pressure is reduced. The valve is installed in the 3-way
2.
valve. When a shut down is commanded and the fuel lock is closed, the ignition
system continues to burn the remaining fuel in the manifold. This will cause the
3. The vaporizer receives liquid fuel at tank pressure from the fuel lock valve and
reduces that pressure to slightly less than atmospheric. When the engine is
to the mixer bowl on the throttle body where the fuel is mixed with intake air.
4. In the process of reducing the pressure from approximately 150 PSI in the tank
to atmospheric pressure, the liquid propane expands to become vapor, causing
refrigeration. To compensate for this and to assist in vaporization, coolant from
the engine cooling system circulates through the vaporizer to prevent freezing.
5. It is reasonable to expect 5,000+ operating hours without a need to replace any
parts in the LPG system, assuming good maintenance is followed and a normal
operating environment exists.
6. Generally, if the engine starts consistently and idles well, testing and rebuilding
of major fuel system components is not required. If starting or idling becomes
a problem and the general maintenance procedures have been checked and
followed, have the LPG system evaluated by trained service personnel.
Every 30 Days
Clean and Check for Leaks
1.
equivalent petroleum solvent. Carefully check for frosted areas and gas odor
2. Check fuel, water, and fuel vapor hose connections and major LP components
for evidence of leakage. Look for stains or frost caused by evaporation. Check
if there is gas odor indicating leakage. Tighten cover screws as required.
APRIL 15, 2012
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