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Never add coolant concentrate alone or water alone. Always
pre-mix concentrate and water prior to adding to the cooling
system.
When ambient temperatures are expected to drop below -29°
F (-34° C), ethylene glycol coolant concentrate mixed 60% by
volume may used. See table below for freezing and boiling
protection information.
Ethylene Glycol
Concentration
Freeze
Protection
Boiling
Protection
50 Percent
-36° C (-33° F)
106° C (223° F)
60 Percent
-51° C (-60° F)
111° C (232° F)
Do not use ethylene glycol coolant in concentrations of great-
er than 60%. Greater concentrations result in less freezing
and boiling protection. 100% ethylene glycol coolant will
freeze at -9° F (-23° C).
Supplemental Coolant Additives (SCA’s) that are part of the
coolant provided by Allmand are depleted during engine
operation. These additives must be replaced periodically.
SCA’s must be added at the proper concentration. Over-
concentration of SCA’s can cause the inhibitors to drop out
of solution, and be detrimental to the cooling system’s perfor-
mance.
Have the coolant analyzed regularly to determine when it is
necessary to add SCA’s.
For further information on coolant for your engine, see the
engine operator’s manual.
General Maintenance Schedule - Engine
Follow the engine manufacturers recommended maintenance
schedule for the engine in your Maxi-Heat heater trailer. For
maintenance schedule information for your engine, see the
Caterpillar engine Operation and Maintenance Manual, or the
Isuzu engine Instruction Manual.
General Heater Unit Fuel Information
If your heater trailer is equipped with a single fuel tank, see
General Engine Fuel Information.
If your heater trailer is equipped with a three fuel tanks, you
may choose to use a different fuel for the heater units than
the engine. Diesel fuels that meet ASTM D975 for Ultra Low
Sulfur Diesel (ULSD) are recommended. Diesel fuel may
be No. 1-D or No. 2-D. However, Kerosene K-1 may also be
used as fuel for the heater units. Never use gasoline, maph-
tha, solvents of paints alcohol or other highly flammable fuels.
For further information on fuel for the heater units, see the
MCS User And Maintenance Book.
Removing Accumulated Fuel
Look inside the heater unit outlet and check the bottom for
any accumulated fuel. If fuel is present, remove the fuel from
the combustion chamber before starting the heater unit.
To remove accumulated fuel:
1. Remove the air outlet cone (A, Figure 48) by removing
the screws (B) that secure it to the heater unit.
2. Place a suitable container to catch excess fuel under the
heater unit.
3. Locate the curved plate (C, Figure 48) at the bottom of
the combustion chamber. Remove the screws that hold
the plate, and remove the plate and gasket.
4. Allow any accumulated fuel to flow out of the opening
and into the container. Allow an additional 20 minutes
after fuel has stopped flowing to allow evaporation of the
remaining fuel in the combustion chamber.
5. Re-install the curved plate and gasket using the screws
removed in Step 3. Use a new gasket if the original is
damaged during disassembly.
6. Re-install the air outlet cone to the heater unit using the
screws removed in Step 1.
Figure 48
A
B
C
Cleaning The Heater Unit
It is recommended that the combustion chamber and chim-
neys be cleaned once a year or as required. The main fan
should also be cleaned periodically. For information on
cleaning the heater unit, see the MCS User And Maintenance
Book.
Elevating The Heater Trailer With A Jack
WARNING
Crush Hazard
Working under a trailer being elevated only by a jack could
result in death or serious injury. Always support the trailer
with appropriate jack stands or blocking before working
under it.
It may become necessary to elevate the heater trailer with
a jack to change a tire or service the axle. Use a jack rated
for a minimum of 2 tons (1.8 t) to elevate the trailer from one
Not
for
Reproduction
