9-41. DISASSEMBLY OF TILT CYLINDERS
9-36. HP SERIES TILT CYLINDER.
9 - 4 2 . Be sure to have a retaining ring, orings,
backup washer, and piston teflon seal on hand prior
t o disassembly of this cylinder.
These parts will
usually be damaged during disassembly. Disassem
ble as follows:
9 - 3 8 . Fill the tilt cylinder with the rod fully re
A very small air space needs to be left in
a. Using a punch or piece of key stock, push the
the cylinder for proper operation. Filling the cyclin
retaining ring around the slot so that it can be forced
der as full as possible when in the angle shown in
b. Pull the retaining ring out of the slot.
c. Extend the rod to dislodge the head.
9 - 4 0 . A t e s t o f the platform " f r e e f a l l " w i l l d e -
termine that the
correct amount of air is present.
d. If the rod needs repacking, it is recommended
Test as follows:
that the piston nut and piston be removed. The pin
end of the rod may be slightly distorted.
a. Tilt the platform to the ground.
9-43. REASSEMBLY OF TILT CYLINDERS
b. Measure the vertical distance from the tongue
944. Reverse the procedure in 9-42 and drive in
to the top front edge of the frame.
a new retainer ring.
c. Using an assistant to take the measurement,
start walking towards the front of the platform (see
d . The platform should drop suddenly a small
amount when you walk past the pivot. The assistant
should note the amount of "free fall".
e. The correct amount of "fall" is 3 to 4 inches
( 7 6 . 2 - 101.6 mm). If less, there is not enough air
If more, there is too much air in the
in the cylinder.
FIGURE 9-130 MEASURING FREE FALL ON
HP SERIES PLATFORM.
FIGURE 9-14. LOCATION OF SLOT FOR
FIGURE 9-12. FILLING THE HP AND GHP
Change 3 9-1