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HYDRAULIC RAMS
Ram Seal Replacement- General Information
1. Whenever possible the ram should be removed from the machine and cleaned off before dismantling on a
clean work bench.
2. When using a bench vice, do not apply excessive pressure to the ram cylinder-use soft metal jaws
grasping the ram rod.
3. Remove scores and nicks on the ram rod by using a fine oil stone. Do not use a file or emery cloth.
To Change Seals on Angle, Reach and 40 MM Dia Lift Ram
1. Unscrew the gland and withdraw to complete rod assembly. Remove piston locking nut, slide the piston
and gland housing off the rod.
2. Lubricate all new seals prior to assembly.
3. Replace the gland seals ensuring they are positioned in the same location from which they were removed.
Carefully place the gland housing complete with seals back on the rod.
4. Separate the piston halves and discard rod seals. Rebuild the piston onto the rod fitting a new piston rod
"O" ring.
5. The piston seals can be replaced in conjunction with the above operation or alternatively, gently prised into
position after the piston and locking nut are reassembled.
6. Refit the piston locking nut using "Permabond A113" or a similar medium strength thread locking
compound.
7. Reassemble the completer rod into the ram cylinder. Screw in gland housing and tighten.
To Change Seals on 50 MM Dia Lift Ram
1. Unscrew the gland and withdraw the complete rod assembly. Slacken piston grub screw, unscrew the
piston and slide off the gland housing.
2. Gland Seals - Replace as necessary. Ensure seals are replaced in the position from which they were
removed.
3. Piston Seal - Remove split members of the piston and seal and then, using a soft lever which will not
scratch the piston lift the remaining seal components from the piston. Replace with the new seals in
reverse order.
4. Refit gland housing on the rod. Be careful when easing the wiper seal over the piston rod shoulder.
5. The piston is locked onto the rod with a medium strength thread locking fluid such as "Permabond A113",
"Loctite Nutloc 242", "Dunlop Nutloc SAS110", "Tru lock Nutgrade 375" or "Hermetite Torqueseal M".
6. The threads must be cleaned with a suitable solvent to remove oil thoroughly dried before applying a
complete film of the locking fluid to the rod threads. The piston should be screwed on, tightened firmly and
left for 30 minutes before filling with oil and 1 hour before pressurizing.
SWINGTRIM 03/09
© 2009 Alamo Group Inc.
MAINTENANCE
Maintenance Section 5-5
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