Enerpac W Serie Hoja De Instrucciones página 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 pin by removing the pin
retaining screws.
• Remove all 'O' rings from the pin.
• 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 threads in the drive unit,
assemble the swivel pin and tighten
the degreased retaining screws, as
follows:
a) W2000 and W4000:
(M4 screws) – 5,1 Nm
b) W8000 and W15000:
(M5 screws) – 10,2 Nm.
• Reverse the procedure to reassemble
• Pressurise 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 fastener head
• 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 (17).
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