POWER TRAIN 999 SERVICE/MAINTENANCE MANUAL
7-8
Published 05-16-17, Control # 233-03
ENGINE CLUTCH
A disc-type manually operated clutch (see Figure 7-6) is
mounted between the engine and the pump drive. The clutch
allows the pump drive to be disconnected from the engine,
thereby reducing engine load and making start-up easier.
The clutch can be engaged or disengaged while the engine
is running or off.
The clutch can be operated either:
• Electrically with the switch on the front console in the
cab
• Manually with the handle above the pumps in the left
rear enclosure
Maintenance
1. Grease the clutch monthly. See Lubrication Guide in
Section 9.
2. At least once each month:
a. Park all crane functions (brakes applied) before
disengaging the clutch.
b. Disengage and engage the clutch several times with
the engine running. This practice will clean the disc
surfaces and prevent the discs from seizing.
c. Disengaging the clutch with the handle while
checking for proper free travel. Free travel should
be at least 3/4 in (19 mm) as shown Figure 7-6
.
Readjust the clutch when free travel decreases to
less than 3/4 in (19 mm).
Adjustment
The clutch is adjusted internally through the hand hole on top
of the clutch housing. See the manufacturer’s manual for
adjustment instructions.
CAUTION!
Parts Damage!
Do not run engine longer than 20 minutes with clutch
disengaged. Clutch release bearing can be damaged.
DANGER!
Moving Machinery Hazard!
Parts inside clutch rotate when engine is running. Stop
engine before adjusting clutch.
FIGURE 7-6
3/4 in (19 mm)
Minimum Free Travel
Engine
Disengaged
Handle
Clutch
Pump
Drive
View from Rear of Engine
Engaged
Engaged
Disengaged
1/2 to 9/16 in (13 to 14 mm)
Release Travel
1/8 in (3.3 mm) Free Travel
between Yoke and Wear Pads
Electric
Cylinder
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