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Belt Tension:
lbf (kg)
Cummins ISB, ISC, ISM Refrigerant Compressor 100 (45)
Mercedes-Benz MBE900
Fan and Alternator 29.5 (27.9)
Refrigerant Compressor 30.0 (28.4)
Table 1, Drive Belt Tensions
01–03 Pacbrake Inspecting and
Maintenance
With frequent use, the Pacbrake Exhaust Brake will
operate maintenance-free. If the vehicle is used in-
consistently or seasonally, it will be necessary to per-
form preventative maintenance. If the vehicle is ex-
posed to excess moisture, or is used only for
periodical or seasonal use, perform the following
steps:
1. With the engine off, use any oil-free or non-
petroleum based high-heat lubricant, and spray
or coat a sufficient amount on the restricter valve
shaft and the attaching locations at each end of
the actuation cylinder.
2. With your hands or a pair of pliers, motion the
valve several times to distribute the lubricant
down the shaft and the attaching locations.
NOTE: Operation of the Pacbrake could be af-
fected by starting the engine and idling for short
periods of time. During a cold engine start-up,
moisture occurs in the engine and the exhaust
system that creates a corrosion hazard. The
brake housing may trap water in the valve shaft
bore causing corrosion resulting in an improper
or non-functioning brake. If it is necessary to
periodically start the engine, attain normal oper-
ating temperatures before shutting down the en-
gine.
Engine 01
Acterra Maintenance Manual, January 2007 01/3