31
DOC06820 Rev. A
SERVICE / REPAIR MANUAL
RUNNING FLOOR II
®
DX
5.4.3 Switching Valve Adjustment
Videos:
https://youtu.be/F2kJT_VdAqo
https://youtu.be/f5xCajNklyk
1.
Use the ball valve to stop the drive unit. The ball valve (On/Off) is located toward the front of the
drive unit, in front of the hydraulic cylinders. Push the ball valve handle toward the center of the
trailer, which will allow the hydraulic oil to bypass the drive unit.
2.
Loosen the 3/8” [10 mm] jam nuts located on the threaded rods on each end of the switching valve.
On each threaded rod there are two flat washers and a grommet. The 3/8” [10 mm] jam nuts are
located between the switching valve and the washers. After loosening the nuts, adjust them toward
the switching valve. Doing this will throw the switching valve out of adjustment. Repeat the process
at the other end of the switching valve.
3. Start the truck engine and engage the PTO Let the clutch out slowly. Pull the ball valve handle out to
start the drive unit. The drive unit will move to the load or unload direction. The system will lock up
and be under high pressure when the cylinders reach the end of the stroke. Immediately push the
ball valve handle in toward the center of the trailer to stop the drive unit. This will allow the hydraulic
oil to bypass the system. At this point, the cylinders will be at maximum stroke.
4. Disengage PTO
5. Push the threaded rod in the direction that the cylinders are bottomed. Slide the washers and rubber
grommet out toward the actuator tab on the cross drive. Turn the 3/8” [10 mm] jam nuts out until they
are tight against the washers. Then turn the first nut one extra turn. Bring the second nut up to the
first nut and tighten the two together, setting the jam nuts.
6. Engage PTO
7. Pull the ball valve handle out to start the drive unit, causing the hydraulic cylinders to travel to the
opposite direction. Let the cylinders travel until they lock up. Then immediately push the ball valve
handle in toward the center of the trailer to stop the drive unit.
8. Disengage PTO
9. Push the threaded rod in the direction that the cylinders are bottomed. Slide the washers and rubber
grommet out toward the actuator tab on the other cross drive. Turn the 3/8” jam nuts out until they
are tight against the washers. Then turn the first nut one extra turn. Bring the second nut up to the
first nut and tighten the two together, setting the jam nuts.
10. The switching valve adjustment is completed.
