Engine Mounts; Electronic Foot Pedal Assembly (Efpa) & Throttle Position Sensor; Automatic Belt Tensioners And Idler Pulleys Inspection - PREVOST H3-41 Maintenance Manual

3. Refill cooling system with saved fluid (refer
to Section 05
COOLANT SYSTEM
4. Once engine fuel system has been drained,
it will aid restarting if fuel filters are filled with
fuel oil (refer to Section 03
5. Start engine for a visual check. Check fuel,
oil, cooling, pneumatic and hydraulic system
connections for leakage. Test operation of
engine controls and accessories.

2.8 ENGINE MOUNTS

The power plant assembly is mounted to the
cradle by means of rubber mounts and supports.
Two engine support brackets are used at the
front of the engine while two rubber mounts are
mounted at the back of the engine.
It is recommended that new rubber mounts be
installed at each major overhaul.
3. ELECTRONIC FOOT PEDAL ASSEMBLY
(EFPA) & THROTTLE POSITION SENSOR
The Electronic Foot Pedal Assembly (EFPA)
connects the accelerator pedal to a Throttle
Position Sensor (TPS). The (TPS) is a device,
which sends an electrical signal to the Motor
Control Module (MCM).
voltage depending on how far the pedal is
depressed. The system is installed in the space
normally occupied by a mechanical foot pedal.
The (EFPA) has maximum and minimum stops
that are built into the unit during manufacturing
(Figure 16). The (TPS) converts the operator's
foot pedal input into a signal for the MCM.
When installed by the equipment manufacturer,
the TPS should not require adjustment. If the
TPS is suspected of being misadjusted, confirm
that the sensor is installed in accordance with
the manufacturer's
recommended that the idle count be at 50 or
higher with a full throttle count of up to 200.
The TPS is self-calibrating and therefore has no
optimum closed throttle or wide open throttle
count value. If the counts are within the 50 to
200 range, the sensor is properly set.
).
).
FUEL SYSTEM
The TPS varies in
specifications. It is
PA1621 Maintenance Manual All Series | Section 01 revised Feb 2019
FIGURE 16: ELECTRONIC FOOT PEDAL ASSEMBLY
Monitor the (TPS) at the controls as you move it
through its full stroke. Be sure there is no
misalignment or obstruction preventing the
smooth movement of the TPS through the full
stroke. Using a diagnostic data reader, check
that the idle and full throttle position counts do
not fall within the error zones. The error zones
occur when the idle position is less than 14
counts, or when the full throttle position is more
than 233 counts. Should these conditions occur,
the CPC will signal diagnostic codes of 21-12 for
idle error and 21-23 for wide-open throttle error.
4. AUTOMATIC BELT TENSIONERS AND
IDLER PULLEYS INSPECTION
With the engine running, if noise is coming from
the tensioners or drive system, an inspection
with the engine off is necessary.
MAINTENANCE
Remove belts and inspect automatic belt
tensioners, idler pulley bearings at the
intervals specified by the Lubrication And
Servicing Schedule
LUBRICATION & SERVICING.
SECTION 01 : ENGINE
3035
in Section 24:
23