Enerpac W35000 - Manual (Page 11)

11
5.2 Full maintenance
5.2.1 The hydraulic drive unit
• Remove the circlip from the swivel
coupling.
• Remove the couplings.
• Remove the swivel-coupling block
from the drive unit.
• Remove the swivel post by removing
the swivel post retaining screws.
• Remove all ‘O’ rings from the swivel
post.
• Carefully hold the cylinder body to
unscrew the cylinder gland.
• Hold the two flat sides of the piston
rod with a spanner. The rod is located
at the spigot.
• Remove the button head cap screw
from the piston.
• Remove the piston rod from the
cylinder spigot end.
• Remove the piston from the cylinder
gland end, using a suitable drift.
• Clean all exposed components with a
mild solvent.
• Inspect all parts for damage.
• Carry out non destructive testing by
magnetic particle inspection on the
following components:
- Cylinder
- Piston rod
• Apply a small amount of Loctite 243
to the threads of the piston retaining
screw before reassembly.
• Apply a small amount of Loctite 243
to the threaded holes in the drive unit.
Assemble the swivel post and tighten
the degreased swivel post retaining
screws (M5 screws) to 10,2 Nm.
• Reverse the procedure to reassemble
• Pressurize the assembled drive
unit to max pressure (Advance and
Retract), and check for any signs of
leakage.
When reassembling the drive unit
make sure that the piston rod is
inserted through the cylinder
spigot end.
When reassembling the drive unit
make sure that the piston is
inserted through the gland end.
Tap the piston gently into place
against the piston rod.
5.2.2 The cassette
• Strip down and clean all exposed
components with a mild solvent.
• Drift out the roll pin holding the
cylinder retaining pin, and remove.
• Inspect all parts for damage.
• Carry out non destructive testing by
magnetic particle inspection on the
following components:
- Sideplates
- Locating plate
- Pin retainer
- Reaction foot
- Crank
- Ratchet
- Drive shoe
- Cylinder retaining pin
- Spacer retaining pin
• Dry all components. Apply a thin
coat of molybdenum disulphide as
indicated (19).