Brunswick 750 IMPACT, Operation & Maintenance Manual

Page: 141 / 156

7-5
Collar Maintenance Section 7
12 VDC Air Pump
A 12 VDC inflation pump is supplied with your boat.
The 12 VDC inflation pump can be used to inflate the
collar system and make routine adjustments in collar
air pressure.
Whenever possible, the collar should be inflated and
the pressure should be verified when the ambient air
temperature is between 65°F and 75°F (18°C and
24°C). You should fill the individual chambers evenly,
from front to back.
The nominal collar inflation pressure should be 3.48
PSI (240 mB). The over-pressure valves will begin to
regulate collar air pressure at approximately 3.90 PSI
(269 mB).
Check the collar inflation pressure using the pressure
gauge supplied in the boat’s collar maintenance kit.
There is a direct correlation between ambient air tem-
perature and collar air pressure. Collar air pressure
increases by about 0.05 PSI for every 2°F increase in
temperature (3 mB per 1°C).
It is a normal collar inflation cycle, then, for a col-
lar to lose air volume during a hot, sunny day and
appear to be partially deflated the next morning.
Always re-inflate the collar and monitor the pres-
sure cycle before assuming the collar is leaking.