Alamo 7191852C - Manual (Page 105)

MAINTENANCE
PA91 03/09 Maintenance Section 5-7
© 2009 Alamo Group Inc.
MAINTENANCE
HYDRAULIC RAMS
Ram Seal Replacement - General Information
11. Whenever possible the ram should be removed from the machine and cleaned off before dismantling on a
clean work bench.
12. When using a bench vice, do not apply excessive pressure to the ram cylinder - use soft metal jaws when
grasping the ram rod.
13. Lubricate all new seals thoroughly prior to assembly.
Angling Arm
Replacing Seals
1. Unscrew the gland and withdraw the complete rod assembly. Remove piston locking nut, slide the piston
and gland housing of 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 pried 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 complete rod into the ram cylinder. Screw in gland housing and tighten.
Reach Ram
Renewing Gland Seals
1. Unscrew the gland nut using a C spanner and withdraw the complete rod assembly.
2. Remove the piston using a peg scanner and slide off the gland housing.
3. Replace the seals as necessary.
4. Ensure that seals are replaced in the same attitude and in the same position from which they came.
Refitting a Piston
The piston is locked onto the rod with a medium strength thread locking fluid such as “Permabond A113”,
“Loctite Nutloc 242”, “Dunlop Nutloc SA5110”, “Tru lock Nutgrade 375” or “Hermatite Torqueseal M”. The
threads must be cleaned with a suitable solvent to remove oil and thoroughly dried before applying a complete
film of 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.