JCB EcoMAX Engine Installation Manual
Page 28 of 64 320/A9164-1 © JCB Power Systems Ltd.
9.3 Front End Accessory Drive (FEAD)
W WARNING!
The engine has rotating parts. You must make sure that you give a clear warning to stop anyone
starting the engine when someone is working on the FEAD due to risk of personal injury.
The FEAD gives drive for the cooling fan, water pump, alternator, and an air conditioning
compressor. The alternator is direct mounted to the RHS of the engine and driven by the
FEAD system. You must allow for the direct mounting of an air conditioning compressor to
the lower left-hand side of the engine.
9.3.1 Torsional Vibration
The JCB EcoMAX engine gives generally refined torsional vibration characteristics. The
crank is exceptionally stiff giving very low levels of wind-up between the crank pulley and the
flywheel.
Torsional vibrations must not present a problem for transmissions (manual and torque
converter) and hydrostatic pumps typically used in construction equipment and attached to
PTO No. 1.
There may be instances, particularly in respect of devices attached to PTO No. 2 and
devices that require particular limits on torsional vibration, where care needs to be taken to
ensure the engine characteristics are appropriate. In such cases cyclic velocity curves are
available from JCB Power Systems on request.
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