Prochem Legend SE AD - Manual (Page 42)

MAINTENANCE
LEGEND SE 980059 07/23/02 4-10
CHEMICAL PUMP
The only repairs which the chemical pump may
require is the replacement of the diaphragm or check
valves. To replace the diaphragm, unscrew the cover
from the body. When replacing the diaphragm,
lubricate the outer edges of the diaphragm with o-ring
lubricant, Part #05-008035, and reassemble. To
replace the check valves, unscrew the check valve
caps. Replace the check valves and reassemble,
using new o-rings.
DO NOT attempt to re-use o-rings once the check
valves have been removed. See the “Illustrated
Parts Listing” for a parts break-down on the chemical
pump.
PACKING NUT ADJUSTMENT FOR
CHEMICAL METERING, BYPASS, &
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. Turning the knob clockwise
increases pressure, turning the knob counter-
clockwise decreases pressure.
CHEMICAL
SELECTOR
VALVE
CHEMICAL
METERING
or
HEAT BYPASS
VALVE
PACKING NUT
PACKING NUT (use 5/16"
open end wrench to adjust)
Remove knob
By loosening set
Screw to access
Packing nut.