8. Up to this point, the hydraulic system has been run
HYDROSTATIC TRANSMISSION START-UP
with the pumps and motor in neutral position, and the
PROCEDURE (Figures 26, 27, 28 and 29)
oil has been going thru a "by-pass" system back to
the tank.
The hydraulic system has been filled at the factory;
however, if for some reason the system has been drained
9. If the traction drive pump has been replaced, proceed
(Refer to Page , Draining and Refilling the Hydraulic
with step 9A - "Setting external pump lever arm stops,"
Oil System), the following start-up procedure is
figure 27. If the vibration control pump has been re-
recommended.
placed, refer to page 17, "Vibration Frequency Adjust-
NOTE
ment." Then continue with step 10.
One common tank supplies oil for the traction drive
A. Set External Pump Control Lever Arm Stops,
system, vibrator control system and the power
figures 28 and 29 . Figure 27. Remove the pump con-
steering system.
trol cable from the pump control lever arm. Loosen
lock nuts and back off on adjusting screws. Manually
The method of filling the hydraulic oil tank is based
move the pump control lever arm in one direction to
on passing the oil thru a #10 micron filter as recom-
its maximum stroke. This will "bottom" the lever arm
mended by the "Sundstrand Corp.", manufacturers
internally inside the pump. Now adjust the setscrew
of the hydrostatic pumps and motors used on the
Rollers. The filter system (10 micron) is outlined
on pages 71 and 72.
During the start-up procedure, the hydraulic system will
be noisy due to air in the system. As the start-up pro-
gresses, the system will be relieved of the air and
voids as oil fills these cavities.
1. Make sure a new and clean oil filter has been in-
stalled in the tank and the tank cover replaced tightly.
2. Place the "forward-reverse travel lever", item 14,
page 9, and the "vibration control lever", item 13,
page 9, in neutral (detent position).
3. Remove filler cap from the tank and leave the cap
off until after the start-up is completed.
FIGURE 26
4. Add a recommended oil to the tank using system as
outlined on page . If a system of this requirement is
not used, the oil must be passed thru a #75 micron filter
or a #200 mesh screen.
5. Fill tank to sight gauge level. As oil seeps thru the
internal tank filter, into the system, the oil level will
drop. Continue adding oil until the level stabilizes at
the sight gauge level. This may require a period of 20
to 30 minutes. CAUTION: At this point the complete
system is not filled.
6. Start engine and RUN AT IDLE SPEED (NO
FASTER) DO NOT REV. UP ENGINE. Run at idle
speed for a period of 5 minutes. This will purge air
from the system as oil fills the cavities. Turn steering
wheel during this step from left to right and vise-versa.
Steering will be felt in "jerks" as air is purged from
the steering system. When all air is purged, steering
will be smooth and decisive. Stop engine. Add oil to
FIGURE 27
sight gauge level.
enough so the pump lever arm DOES NOT "BOTTOM"
7. Again start engine and run at approximately 1000-
INTERNALLY, BUT "BOTTOMS" AGAINST THE
1300 RPM for a period of 5 minutes. Check for any oil
SETSCREW. TIGHTEN DOWN LOCK NUT. Repeat the
leaks. Return to idle speed, then stop engine. Add oil
above in the opposite direction.
to tank if necessary.
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