Eaton TRSM0515, Руководство по обслуживанию

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TROUBLE SHOOTING
RANGE SHIFT AIR SYSTEM
If transmission fails to make a range shift or
shifts too slow, the fault may be in the air system
or actuating parts in the shifting bar housing. To
check the air system and pin-point the trouble
area, the following procedures are recommended,
using the check points indicated by letters in the
diagram on page 11.
Checks are to be made with the vehicle engine
off, but with normal vehicle air pressure.
1.
Incorrect Hook-up
With normal vehicle air pressure and gear shift
lever in the neutral position, move the control but-
ton up and down, from one range to another.
a. If lines are crossed between the control valve
and the air valve on transmission, there will
be a steady flow of air from the bottom ex-
haust in control valve with button in the up
position.
b. If lines are crossed between the air valve on
transmission and the range cylinder, the
transmission gearing will not correspond
with the button position. Low range, down
position of button, will result in high range
gear engagement in the transmission and
vice versa.
2. Air Leaks
With normal vehicle air pressure and gear shift
lever in the neutral position, coat all air lines and
fittings with soapy water and check for leaks,
moving control button to both positions.
a. If there is a steady leak out exhaust of range
control valve, there are defective parts or
O-rings in the range control valve.
b. If there is a steady leak out breather on slave
valve: there is a defective O-ring in the slave
valve, or there is a leak past O-rings on the
range shift cylinder piston.
c. If transmission fails to shift into low range or
is slow to make the shift and the transmis-
sion case is pressurized, see Check Point E.
d. Tighten all loose connections and replace
defective parts or O-rings.
3. Check Point A, Air Regulator
With normal line pressure and gear shift lever in
neutral, check exhaust port of air regulator. There
should be no leak from this port.
Cut off the vehicle air pressure and install air
gauge in line at output port of air regulator. Bring
vehicle air pressure to normal. Regulated pressure
should be 57.5 to 62.5.
Only as a last resort should an adjustment be
made with the screw in bottom of regulator. This
adjustment has been set for correct operating
limits. Any deviation from these limits, especially
on regulators which have been in operation for
some time, will in most cases be caused by dirt or
worn parts. Adjustment of screw will give only a
temporary remedy.
(1) Turning screw in (clockwise) raises air pres-
sure.
(2) Turning screw out lowers air pressure.
Air regulator is not serviceable and should be re-
placed if defective.
4. Check Point B
With normal vehicle air pressure and the gear shift
lever in the neutral position, pull the control button
up to high range and disconnect the 1/8Ó nylon air
line from out port of control valve at the air valve.
a. When control button is pushed down a steady
blast of air will flow from disconnected line.
Air will shut off when button is pulled up. This
indicates that control valve is operating cor-
rectly. Reconnect air line.
b. If control valve does not operate correctly,
check for restrictions and leaks; leaks indi-
cate bad O-rings.
5. Check Point C
With normal vehicle air pressure and gear shift
lever in the neutral position, push the control but-
ton down to the low range position and disconnect
the high range air line, either at fitting on shift
cylinder or at side port or slave valve.
a.
b.
c.
Pull the control button up. There should be a
steady flow of air from the high range port.
Push button down to shut off air.
Make sure vehicle engine is off and move the
gear shift Iever to a gear position. Pull the but-
ton up; there should be no air at high range
port. Move the gear shift lever to neutral;
there should now be a steady flow of air from
the high range port. Push button down to shut
off air and reconnect the high range air line.
If air system operates incorrectly, this in-
dicates that the slave valve is defective, or
that actuating parts in shifting bar housing
are jammed or defective.
AIR SYSTEM