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VACUUM EXHAUST HEAT EXCHANGER
Removing and cleaning the vacuum exhaust pre-
heater core is recommended as needed or if the unit
was operated with the vacuum inlet filter damaged,
removed, or improperly installed. Pull out the core
and remove all debris, being careful not to drive
debris deeper into the core. We recommend
removing the debris with water by either submerging
the core and moving it back and forth until the debris
loosens and falls off or by spraying the debris out of
the core. Allow the core to dry before reinstalling.
HIGH PRESSURE HOSES
Inspect your high pressure hoses for wear after
the first 100 hours of use. Inspect every 25 hours
thereafter. If hoses show any signs of damage or
impending rupture, replace the hose .
DO NOT attempt to repair high pressure hoses!
Repairing high pressure hoses may result in
severe burns and serious injury!
All high pressure hoses must be rated for 3000
PSI at 250°F. Thermoplastic hoses do not meet
these specifications and should not be used.
Severe burns and injury may result if the hoses
do not meet these requirements.
GENERAL SERVICE ADJUSTMENTS
DO NOT service this unit while it is running. The
high-speed mechanical parts as well as high
temperature components may result in severe
injury, severed limbs, or fatality.
ENGINE SPEED
To adjust the engine RPM, refer to the Briggs &
Stratton Vanguard Service and Repair
Instructions for specific instructions.
DO NOT attempt to adjust without a tachometer
and NEVER adjust the engine above 3200 RPM.
VACUUM PUMP DRIVE BELTS
To tighten the vacuum pump belts:
1. Loosen the four bolts which hold the vacuum
pump mount in place.
2. Turn the adjusting bolts until the proper belt
tension is achieved (1/2" deflection in the center
of the belt, halfway between the pulleys).
NOTE: When adjusting belt tension, make certain
that the engine shaft and vacuum pump shaft remain
parallel, and the belt tension is equal throughout the
belt width.
3. After adjusting, re-tighten the four bolts which
hold the vacuum pump in position. Check pulley
alignment with straight edge.
WATER PUMP DRIVE BELT
To tighten the water pump belt:
1. Loosen the nuts which hold the water pump
mount to base.
2. Adjust the belt tension adjusting bolt until the
proper belt tension is achieved. (1/2" deflection
in the center of the belt, halfway between the
pulleys).
3. While checking the alignment, tighten the pump
mount hold-down nuts.
FLOAT VALVE (WATER BOX)
The float valve should only be adjusted if the water
box is overflowing or the water level in the box is
lower than 5-1/2":
1. If the box is overflowing, remove, and check the
float valve for debris or damage.
NOTE: If the float ball has any water inside it must
be replaced.
When replacing float ball, DO NOT over tighten,
the rod can puncture ball. Make sure to tighten
nuts on rod.
2. Disassemble the valve and check the piston and
seat for damage, replace if needed. See the
Illustrated Parts Listing for a parts break-down.
BLAZER 980073 09/16/02
MAINTENANCE
4-8
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