Prochem Apex GTX User Manual

Page 50

Maintenance

Engine Coolant Replacement

The coolant should be replaced every year. This
coolant is an integral part of the heating system and
needs to be maintained as any other working part of the
system. We recommend that this procedure be accom-
plished by the following steps.

Draining Coolant:

1. Insert a hose into the radiator drain petcock. Turn

counterclockwise to open and drain coolant. After
draining approximately 1/2 gallon, open bleed
petcock on helicoil to assure that helicoil drains
also. Allow the coolant to completely drain. Also
drain engine block from under the governor.

Be sure that used coolant is collected in a proper
container and disposed of in accordance with local
laws.

2. After draining is complete, close both the radiator

and helicoil petcocks.

Replacing Coolant

1. Fill radiator with 50/50 water/coolant mix.

2. Start unit and set throttle to idle position.

3. As the unit warms up, maintain a full radiator with

more water/coolant mix.

4. Open petcock completely on helicoil to allow any

trapped air to escape. When coolant runs out of
helicoil, close petcock.

5. Fill radiator with water/coolant mix.

6. Re-install radiator cap.

7. Shutdown unit.

Check radiator overflow bottle. Add water/coolant to
proper "cold" level.

General Service Adjustments

USE EXTREME CAUTION The high-speed mechan-
ical parts as well as high temperature components may
result in severe injury, severed limbs, or fatality.

Engine Speed

This unit uses a governor to set and maintain engine
speed. 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.

DO NOT attempt to adjust without a tachometer and
NEVER adjust the engine to exceed stated
maximum RPM (Full Load). Permanent damage
may occur.

Engine Speeds

Gas Engines

Diesel Engines

Idle

Throttle Pushed In

850 rpm

1300 rpm

Maximum

Throttle Pulled Out

2740 rpm

2650 rpm

86341750 APEX GTX