MAINTENANCE
PERFORMER 980060 07/01/02
4-11
VACUUM RELIEF VALVE
While the unit is running at full RPM, block the air
flow at the vacuum inlet connection and read the
vacuum gauge. If adjustment is required, shut the
unit down and adjust the vacuum relief valve locking
nut tension. Start your unit and read the vacuum
gauge. Repeat this process until the relief valve
opens at 14" Hg (13” Hg for the PERFORMER 405).
VACUUM PUMP DRIVE BELTS
To tighten the vacuum pump belts:
1. Loosen the two nuts which hold the air pump
mount in place (for units equipped with the
catalytic engine exhaust heat exchanger and air
pump).
2. Loosen the four screws which hold the vacuum
pump mount in place.
3. 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.
4. After adjusting, re-tighten the four screws which
hold the vacuum pump mount in position. Check
belt alignment with straight- edge.
5. Readjust and check air pump belt. DO NOT
over-tighten belt. Re-tighten the two nuts which
hold the air pump mount in place. Check belt
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 position of 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 nuts
which hold the water pump mount to base.
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,
as the rod can puncture the ball. Make sure to
tighten the nuts on the 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.
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