Prochem Legend GT - Manual (Page 46)

44
Maintenance
General Service 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 engine governor. The
engine speed is adjusted by pulling the throttle out to
maximum travel for high speed operation. For lower
temperature or vacuum setting, rotate knob clockwise
two turns or as needed to obtain desired temperature
and vacuum settings. Pushed in, the engine is at idle
speed (1400 rpm). With throttle pulled out, engine
operates at maximum rpm (2950).
DO NOT attempt to adjust without a tachometer and
NEVER adjust the engine to exceed stated maximum
RPM (Full Load). Permanent damage may occur.
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
#86255430, PRV NO. 05-008035 and reinstall.
Water Box
1. Check inlet strainer for debris and blockage. A
blocked strainer could damage the solution pump if
water flow is restricted.
2. Inspect water box float valve for freedom of move-
ment and water leaking past valve.
Chemical Pump
The only repairs which the chemical pump may require
are the replacement of the diaphragm, plastic disk or
check valves. To replace the diaphragm and plastic
disk unscrew the cover from the body. When replacing
the diaphragm, lubricate the outer edges of the
diaphragm with o-ring lubricant Part #86265430 and
reassemble. To replace the check valves, unscrew the
check valve caps. Replace the check valves and reas-
semble, 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.
Solution and Vacuum Pump Drive Belts
Use only exact replacement for system drive belts. Use
only exact manufacturer and models for replacements.
Make certain that when you re-torque these screws,
that you use a clockwise pattern and continue until
proper torque is achieved.
O-RING
O-RING
TEFLON SEAT
Tight wrap
on spring
SPRING CHECK
VALVE CAP
SEAT
POPPET
Use 5/16 Allen
Wrench to remove
CHECK VALVE DETAIL
Torque Value
Component Inch/lbs Foot/lbs
Rear Engine Hub 300 25
Vacuum Pump Hub 300 25
Front Engine Pulley 108 9
86313050 LEGEND GT