General Pump HTCK4050S - Manual (Page 15)

GENERAL PUMP
A member of the Interpump Group
HTCK4050S
2.2.4 DISMANTLING THE PISTON UNIT
The piston unit does not require any routine maintenance. Maintenance is limited to visual checks only.
Proceed as follows to remove the piston units:
A) Unscrew the M7X1 piston fixing screws as indicated in fig. 24.
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B) Check and verify their conditions, replace if necessary.
At every disassembly, all O-rings on the piston unit must be replaced.
2.2.5 REASSEMBLING THE HEAD - SEALS - PISTON UNIT
To reassemble the various components, follow the reverse operations listed above as described in point
2.2.3, taking particular care to the described instructions:
A) Seals pack: respect the same order used during disassembly operations.
B) Lubricate components 2,3,5 with OCILIS silicone grease p/n 12001600; this operation is also deemed
necessary to facilitate adjustment of the lip seal on the piston.
C) For correct assembly of HP seals in their housing on the head without causing any damage to lip seals,
use suitable tools according to the pump diameters as indicated in Chapter 5.
D) Replace the piston, tightening the screws with a torque wrench, respecting the tightening torque as
indicated in Chapter 3.
E) Assembling the head: for the values of the torques and tightening sequences follow the instructions in
Chapter 3.