Autoquip VERTICAL RAM LIFTS - DUAL RAM - Manual (Page 32)

32
REPLACING RAM SEALS
1. Block the superstructure (see “Blocking Instructions”) and unbolt the platform bolster
plate from the ram(s). It is recommended to mark the plunger and bolster with a
chalk mark or paint to be able to orientate the plunger when re-attaching.
NOTE: Do not allow the plunger to rotate 120 degrees during disassembly or it will
drop below the surface of the seal flange.
2. Raise the ram several inches and clean thoroughly around the plunger and seal-
flange to prevent the possibility of any dirt particles from entering the seal space
while servicing. If the top edge of the ram is rust-marked, it must be polished
smooth or it will not pass through the seal.
3. Apply a light coat of grease around the ram. Lower until it bottoms about a half inch
below the seal groove. If the lowering ram hits solid at about 3/8” above the seal-
flange, rotate it until the arrow stamped in the head plate points toward the bleeder
screw, then finish lowering. The seal should now be exposed.
4. Remove the old seal. Inspect and clean the seal groove using a rag and
compressed air.
5. If foreign matter drops down around the ram, remove as much as possible with an
oil-soaked cloth and/or compressed air. Remove the seal ring and apply pressure to
the system to raise the ram about six inches so that residual dirt particles will cling to
its sides where it can be wiped off. Ignore a slight loss of oil around the ram while it
is raised. When the ram is clean, lower it again,
6. Install the new Wiper-seal in the seal groove by pinching the seal as shown in Figure
15a. Work it all the way around with an inside loop in the seal as shown in Figure
15b.
7. Press the ring tightly into the groove with finger pressure. The ring must be straight
and well seated in the groove before raising the piston. Apply a coating of grease to
the new seal.
8. Using a slow jogging action, inch the ram up past the seal, being sure not to pinch it
as it may squeeze out of the groove. Do not raise the ram all the way up without
reinstalling the superstructure. The friction of the new seal may prevent it from
lowering when empty.
GENERAL MAINTENANCE