MAINTENANCE
PERFORMER 980060 07/01/02
4-13
PACKING NUT ADJUSTMENT FOR
CHEMICAL METERING AND
CHEMICAL SELECTOR VALVES
Examine the packing nut on the chemical metering,
heat bypass, and chemical selector valves for proper
tension every 200 hours. When turning the knob,
there should be a small amount of resistance. If not,
slightly tighten the packing nut. DO NOT over-
tighten. Keeping the valve packings properly
adjusted will eliminate possible leakage from the
valve stems and add to overall valve life.
PRESSURE REGULATOR
The pressure regulator serves only to hold locked up
water pressure at a preset point and to bypass this
water back to the water box.
To adjust:
1. With your unit running, close the cleaning tool.
Check the pressure gauge. Open the tool valve.
We recommend setting the pressure regulator
so that the pressure gauge reads 350 PSI with
the tool valve open.
When the tool valve is opened, there is an
approximate drop of 100 PSI in pressure. If
there is a pressure drop greater than 100 PSI,
it may be necessary to lubricate the o-rings
in the pressure regulator.
2. If the pressure regulator requires adjustment,
turn the adjusting knob (while observing the
pressure gauge on the control panel) until the
desired pressure is obtained.
ADDING/DRAINING ENGINE COOLANT
Use a 70:30 coolant to water ratio in this unit’s
cooling system. NOTE: See the “Maintenance
Chart” for specific details.
1. To drain the coolant, remove the radiator cap and
turn the lower engine radiator draincock counter-
clockwise. Also open the draincock on the heli-coil
and remove the lower heli-coil plug, until drained.
2. To add coolant, first install the heli-coil plug and
fill the radiator. Next, bleed the air out of the system
by turning the heli-coil heat exchanger draincock
counter-clockwise. The heli-coil heat exchanger
draincock is located on the heat exchanger casting
on the right side of the console. After bleeding the
air out of the heli-coil heat exchanger draincock,
close the heli-coil heat exchanger draincock by
turning it clockwise. Fill the engine radiator once
again. Then add to the overflow container (fill ONLY
halfway between the “add” and “fill” marks). After
running the unit, add more coolant, if necessary, into
the overflow container only.
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