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For example, when operating at a ground speed of 3 MPH (5 km/h) in low range,
the engine speed would be around 2700–3000 RPM. This is well above the
engagement speed of 1500-1800 RPM. However, in high range at 3 MPH (5 km/
h), the engine would be running at only 1500–1800 RPM. Whenever operating
this close to the engagement speed, the engine may be running at a speed too
low to provide the pinch needed to prevent belt slip. Belt slip is responsible for
creating the excessive heat that destroys belts, wears clutch components and
causes outer clutch covers to fail.
The air temperature in the clutch cover is substantially reduced by using low
range while operating at low ground speeds. Reducing the temperature inside
the clutch cover greatly extends the life of the PVT components (belt, cover,
etc.).
WHEN TO USE LOW RANGE AND HIGH RANGE
CONDITION RANGE TO USE
Operating at speeds less than 7 MPH
(11 km/h)
Low
Towing heavy loads Low
Operating in rough terrain (swamps,
mountains, etc.)
Low
Operating at speeds greater than 7
MPH (11 km/h)
High
PVT DRYING
There may be some instances when water is accidently ingested into the PVT
system. Use the following instructions to dry it out before operating.
1. Position the vehicle on a level surface.
2. Remove the drain plug. Allow the water to drain completely. Reinstall the
drain plug.
3. Start the engine. Place the transmission in PARK.
4. Apply varying throttle for 10-15 seconds to expel the moisture and air-dry the
belt and clutches. Do not hold the throttle wide open for more than 5
seconds.
5. Allow the engine RPM to settle to idle speed, then shift the transmission to
low range.
6. Test for belt slippage. If the belt slips, repeat the process. Your vehicle
requires service as soon as possible, which your authorized dealer can
provide.
156
MAINTENANCE
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