Tennant 1550, Manual

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MAINTENANCE
3--19
1550 Gas/LPG/Diesel MM283 (9--01)
Never operate an LPG powered machine if the
LPG fuel system is leaking, or if any component in
the fuel system is malfunctioning. Operating the
machine under either of these conditions may
cause a fire or explosion.
Check for frosting. If frosting occurs on or near
any LPG component, there is a possibility of an
LPG fuel leak or a malfunctioning component. To
locate the leak, apply a soapy water solution to
the suspected area. Watch for bubbles forming in
the suspected area. This area may have an LPG
fuel leak. Repair or replace the part. Use Loctite
brand Stainless Steel PST thread sealant when
reassembling. This epoxy-type sealant is not
affected by aging or high humidity. Be sure to
follow application directions and apply proper
torque when reconnecting fittings. Never bypass
safety components except to test. If the safety
components are defective, replace them before
operating the machine.
Check routings of all LPG hoses. Keep them
away from sharp edges, exhaust manifolds, or
other hot surfaces. Check for signs of abrasion or
deterioration. Replace hoses found to be worn or
damaged.
FUEL TANKS
The LPG fuel tanks should be inspected for sharp
dents, gouges, leaks, and broken protecting rings
whenever the tanks are refilled. All tank valves
must be inspected for leaks using a soap solution.
Valves must also be checked for dirt, paint, or
other debris in the valve openings. The following
specific checks must also be made:
Tank Size -- The recommended tank size is a 33
lb (15 kg) tank. Larger tanks may impair the vision
of the machine operator.
Filler Valve -- Check for proper functioning and the
presence of the handwheel. Valve must be closed
except during filling.
Safety Relief Valve -- Check for damage. Check
for the presence of the relief valve elbow and the
proper direction of the elbow. If the rain cap is
missing, check for foreign matter and replace the
rain cap. Do not tamper with the relief valve
setting.
Vapor and Liquid Service Valves -- Check for
proper functioning and presence of the
handwheel. The valve must be closed except
when in service.
Tank Service Valve Coupling -- Check for proper
functioning, thread condition, and damaged or
missing washers or o-rings.
Magnetic Liquid Level Gauge -- Check operation
against the maximum filling point as determined
by weight.
D
C A
B
E
03485
TYPICAL LPG LIQUID WITHDRAWAL FUEL
TANK
A. Filler Valve
B. Safety Relief Valve
C. Liquid Service Valve
D. Liquid Level Gauge
E. Tank Service Valve Coupling
An LPG fuel tank with any of the stated defects
must be removed from service and be repaired or
destroyed accordingly.
If an LPG fuel tank is damaged or leaking, it
should be removed to a designated safe area,
and the proper personnel should be notified. Do
not attempt to make repairs to the tank,
regardless of condition. Repairs or disposal must
only be made by qualified personnel.
The care an LPG fuel tank receives has a direct
bearing on how long that tank can be used safely.
LPG fuel tanks must not be dropped or dragged
across any surface. To move LPG fuel tanks, use
a hand truck or roll the tank on its foot ring while it
is being held in a position slightly off vertical.
Whether the storage is inside or outside, fuel
tanks should not be stored in the vicinity of
combustible materials or high temperature
sources such as ovens and furnaces, since the
heat may raise the pressure of the fuel to a point
where the safety relief valves would function. Take
care to insure that the tanks are stored in such a
way that if the safety relief valves do function,
they will relieve vapor, rather than liquid.
Valves on empty tanks must be closed during
storage and transportation.