HAMMELMANN B7.02502.0210, Operating Instructions Manual

Page: 67 / 311

Maintenance
Operating instructions
No.: HDP 502 / S 1100-50
Page 61, Issue: 03.2017
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Copyright Hammelmann GmbH
Germany
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D-59302 Oelde
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Carl-Zeiss-Straße 6 - 8
Pos : 90 /Instandhaltung/Pumpen/Dic htungssatz/DS 2221 HDP 360/480/750 @ 7\mod_1306845678721_2.doc x @ 47064 @ 233 @ 1
11.7 Maintenance of the piston seal assembly: 00.00743.2221
(-004)
The pump unit must be switched off and all lines depressurised before attempting to check
hose connections and leakage points or making inspection and remedy!
Use only correctly sized suitable tools.
11.7.1 Disassembly
 Clear an area of workbench or, if no bench available, lay a sheet of material (paper, cardboard etc.) ready to
accept dismantled parts. The parts should always be laid out in the order of disassembly and in the individual
sets.
Ensure that your workbench is absolutely clean before commencing work.
 Disassembly of the seal assembly (ref. to fig.: Loosen the piston & fig.: Piston seal assembly)
 Disconnect high pressure line/hoses and all other parts.
 Disassemble pump head parts as described under point pump head and lay them cleaned down on a
workbench or similar. Mark the parts i.e. with a felt-tip to know from which valve set they originate.
 The casing bills of the seal assembly lay bare now.
 (Ref. to fig.: Loosen the piston) Unscrew nuts (1) from the stud bolts and remove the cover plate (2) from the
pump intermediate chamber.
 Remove the circlips (480) with circlip pliers for outer circlips.
 Remove the clamp halves (470) by hand.
 Fig.: Disassembly of the piston
Item No. Description
1 Set screws
2 Intermediate chamber
4
Piston rod
20
Piston
360
O-ring
470
Clamp halves
480
Circlip
 The pistons are now loosened from the piston rod.
 Pull out the complete casing (10) from the pump housing i.e. screw two screwings (50) from the pump head in
the thread borings of the casing and pull out the pistons from the pump housing with the help of these screws.
if necessary use fitting lifting tools. Ensure that the piston (20) does not get damaged or does not lost.
 Pull out the piston (20) from the casing (10).
 Fix the casing (10) in a vice with soft cheeks. Ensure that the casing does not get damaged.
 Unscrew the cylinder screws (400) with an inner hexagon key SW 14 and by that separate the flange (30) and
the casing (10).