9/19
NT 1003-A00 09 18 AZ O e
4. OPENING THE PUMP TO INSPECT
THE CYLINDER/PISTON AND BUSHINGS (continued)
4.1 Necessary tools
• 7 - 8 - 30 open-end spanner
• 19 socket spanner
• adjustable spanner
• 1 plastic mallet
• 1 flat screwdriver
• 1 tube for assembling the bearings
4.2 Disassembly for inspection
4.2.1 To remove front cover
Remove front cover screws
410
.
Remove the front cover
401
by progressively separating
it from the pump body and with it the piston
301
, the
shaft and the mechanical seal (shaft part).
4.2.2 To remove piston
Remove the piston
301
by pulling it along the shaft
501
.
4.2.3 To remove mechanical seal and shaft
Remove the mechanical seal and the shaft by following
the directions § MECHANICAL SEAL.
4.3 Reassembly
Reassembly is done in the reverse order than the dis-
mantling.
Take the following precautions :
• Check the condition of the mechanical seal (see §
MECHANICAL SEAL).
• Check the condition of the spring
504
and the piston
bearing (mini length in the rest : 13,5 mm). Light load
must be applied to the spring in order to insert the
piston
301
into the cylinder
201
.
• Check also that the piston backsprings
310
(mini
length in the rest : 22,5 mm).
• Before refitting the front cover
401
, do not forget to
refit the front cover seal
403
after making sure it is in
good condition.
WARNING
BE CAREFUL WITH THE WEIGHT OF
THE PARTS WHEN THEY ARE BEING
REMOVED.
The weight ot the parts
can be dangerous and
may provoke bodily inju-
ries
or material damages.
