MAXX 450D/470D/Diesel Page 1-19
HydraMaster Corporation
High Altitude Operation
Preparation
T
o have your machine run at it’s peak performance; you may have to make adjust
ments depending on the elevation. Elevation plays a key role in how the machine
will operate.
The factory setting of the machine is set for elevations from 0—3,000 feet. Any
time the machine is operated above 3,000 feet there are two areas on the machine
the may need adjustment.
The first area is the carburetor jet. The higher the elevation, the less air is pro-
vided to the fuel mixture. This will make the engine run ‘rich’, and, in turn will
result in the loss of power, excessive heat in the exhaust, and carbon build-up in
the exhaust and heat exchanger system. The jet sizes vary per engine and eleva-
tion. Consult HydraMaster to obtain proper jet size.
Carburetor Jet- See chart below for specific jet size.
Maxx 450D/700G Daihatsu Engine Maxx 470D/950G Daihatsu Engine
Altitude P/N BS&D P/N Jet Size Altitude P/N BS&D P/N Jet Size
0-3,000 ft. (Factory Jet) 076-063 825469 #130 0-3,000 ft. (Factory Jet) 076-064 820627 #140
2,400-6,600 ft. 076-060 820457 #120 2,400-6,600 ft. 076-065 825470 #132
6,000-10,000 ft. 076-062 825471 #112 6,000-10,000 ft 076-061 825291 #126
The second area that may need adjustment is the heat control system. The heat
control system is also optimized to 0-3,000 feet. At highter altitudes the boiling
point of water is lowered. In turn, this can cause the water box to boil and the
high pressure pump to cavitate. The heat control system settings will have to be
adjusted to compensate for the elevation. These settings will vary according to
elevation. Contact HydraMaster to obtain the recommended settings.
Thermal Relief Valve - Change from180°F to 165° F. Order Part No. 000-169-
027 - 165° F Thermal Relief Valve.
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