Prochem Legend XL - Manual (Page 34)

MAINTENANCE
86037400 05/22/08
4-9
SERVICE GENERAL ADJUSTMENTS
USE EXTREME CAUTION while servicing while
machine is running. The high-speed mechanical
parts as well as high temperature components
may result in severe injury, severed limbs, or
fatality.
ENGINE SPEED
This unit uses a factory installed Kohler engine
governor. The engine speed is adjusted using the
throttle control. Pushed in the engine is at idle
speed (1400 rpm). With throttle control pulled out,
engine operates at maximum rpm (2850).
CHECK VALVE (SOLUTION OUTLET)
Inspect the check valve whenever doing service on
the chemical pump or if flow problems occur in the
chemical system:
1. Remove the check valve. Be sure the small o-
ring for the seat comes out with the check valve.
2. Remove the seat, using a 5/16" Allen wrench.
3. Check the Teflon seat for debris or wear. Clean
or replace Teflon seat if needed.
4. Clean the poppet and spring, inspect for wear or
damage, and replace as needed.
5. Re-assemble the check valve. Start the seat by
hand, tighten using a 5/16" Allen wrench. DO
NOT over-tighten seat.
NOTE: Improper seating of the check valve
poppet, damaged spring or o-rings will cause
poor operation of the chemical system.
6. Lubricate the o-rings with o-ring lubricant
Part #86265430, PRV NO. 05-008035 and
reinstall.
WATER BOX
1. Check inlet strainer for debris and blockage. A
blocked strainer could damage the water pump if
water flow is restricted.
2. Inspect water box float valve for freedom of
movement and water leaking past valve.
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 #86265430,
PRV NO. 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.
DRIVE BELTS FOR WATER PUMP
AND VACUUM PUMP
Use only exact replacement for system drive belts.
Use only exact manufacturer and models for
replacements.
Use 5/16 Allen
Wrench to remove
Tight wrap
On spring