Tiffin Motorhomes 2014 Allegro, Руководство пользователя

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TIFFIN MOTORHOMES –ALLEGRO® Chapter 13 ROUTINE MAINTENANCE
13-26
More detailed information can be found in the
manufacturer’s literature associated with the chassis
and/or the tires provided with the motor home. For
example, the following table (Figure 13-9) illustrates
the inflation pressures for Michelin tires as a
function of the loads per position for a specified
speed of the motor home. In this manner, one can
determine the appropriate inflation pressures for
each of the tires on the motor home, as a function
of the loads they are to carry on the trip(s) the
motor home is to take. Whenever there is a
significant change in the loading regimen of the
motor home, it would be wise to recalculate the
load weights of the tires to assure optimal use of
the motor home.
Frequency of Checking Tire Inflation Pressures
When one has determined the “correct” tire inflation pressures for each of the motor-home tires (as a function of the
“fully loaded” condition, of course) and inflated the tires under “cold” (i.e., tires haven’t been driven for more than one
mile) conditions; then the air pressures in the tires should be periodically checked to make sure that they retain their
proper pressures. It is recommended that tire pressures be checked at least once a month (every two weeks would be
better) and before any major trip. On long trips, the tires should be checked every “drive” morning. On short trips (a
day or less), the tires should be checked before one departs on the trip and again before one returns home.
Check tire pressures when they are “cold”; that is, the tires haven’t been driven at all or, at most, less than one mile
before being measured. In this manner, the tire pressure has not been increased by the heating associated with both
tire sidewall and tread flexure associated with traveling. If one must check tires that are warm or hot, remember that
they will necessarily read higher than normal. Do not “bleed” these tires down to the “cold pressure” readings, as they
will probably then be underinflated when they are actually cool. Don’t make any adjustments to tire pressures when the
tires are warm or hot, if such can be avoided.
To make these tire-pressure measurements, it is recommended that one purchase a quality, truck-tire air gauge which
has an angled dual head. This type of gauge allows one to check inflation pressures of both the inner dual wheel which
has the valve stem pointing towards one and of the outer wheel which has the valve stem pointing away from one.
Pressure-sealing valve caps should always be used to protect the valve stems and prevent air from escaping from the
valve stems.
Tire Wear, Balance, and Wheel Alignment
In addition to tire inflation considerations, the tires should also be periodically examined for other types of normal “wear
and tear.” If installed and maintained properly, all tires mounted on the motor home should wear in a smooth, even
pattern. If the tires begin to show irregular wear patterns and the motorhome alignment is still correct, then sometimes
just rotating the tires by changing wheel position and rotation of the tires will allow the tires to wear evenly. Check with
the chassis manufacturer (Freightliner) and its literature (in the Owner’s Information Package) for particulars on
maintaining proper wheel alignment. Tire rotation should include the spare tire in the rotation pattern and changing the
direction of rotation of the tires. Tires can be rotated front-to-rear and side-to-side.
Figure 13-8. Typical Inflation Pressures for Motor Home Tires
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