Yamaha RMAX Type II G Unit, Operation Manual

Page: 62 / 82

Pre-Flight Preparation and Inspection
4-21
2
Water Pump
Inspect the mating surface of the housing cover,
rubber hoses, and rubber hose connections for
any coolant leakage.
During the initial stage of helicopter operation,
the water pump may leak a small amount of
coolant (10 to 20cc could leak from the drain
hole at the bottom of the water pump, onto the
absorbent pad provided on the frame). This nor-
mal condition occurs while the internal seal is
being broken in. It will eventually stop with con-
tinued operation of the helicopter.
3
Radiator
Inspect the radiator cap and the rubber hose
connections for any coolant leakage.
4 Engine
Inspect the mating surface of the cylinder body
and the oil seal for any oil leakage, and the cylin-
der head for any coolant leakage.
5
Transmission and Intermediate Transmission
Inspect the mating surface of the transmission
case and the oil seal for any oil leakage.
A slight stain of coolant or oil does not indicate an
abnormal condition. However, if the coolant or oil is
leaking in a dripping manner, cancel the flight and
request a repair by your dealer.
Radiator Cap
Water Pump
Cylinder Head
Hose
Radiator
When necessary, remove the radiator cap
only after the engine has cooled down. If the
radiator cap is removed immediately after the
engine has been stopped, when the coolant
is extremely hot, the scalding liquid could
shoot out and cause burns.
WARNING
●
Coolant leakage will adversely affect the
cooling performance of the helicopter and
cause it to overheat.
●
Oil leakage will reduce the internal lubrica-
tion of the transmission and damage the
gears and bearings.
NOTICE
Transmission Case
Intermediate Transmission
RMAX.book Page 21 Tuesday, January 17, 2012 3:06 PM