- 13 -
4
、
Stand cylinder vertically with the larger diameter uppermost.
5
、
Insert piston into the cylinder and allow piston to rest on same
surface as that on which the cylinder is resting.
6
、
Grasp the cylinder at the top with both hands and raise and lower
it a few times to check the free fall of the piston. If there is any
feelings of tightness or grittiness remove the piston, rewash both
parts and thoroughly examine for scratching, bruising or other
damage.
7
、
Remove the piston carefully.
8
、
Apply lithium no. 2 grease to the nose
‘
O
’
ring(19) and insert into
groove at nose ofcylinder.
9
、
Apply lithium no. 2 grease to the outside of the nose seal
assembly(24) and insert intocylinder.
10
、
Apply lithium no. 2 grease to the
‘
O
’
ring(22), which fits in the top
of the piston bore andlocate in groove.
11
、
Fit PTFE ring (20) into groove. The fitting of this ring can be
simplified by forming it into a
‘
C
’
shape and then inserting it into the
groove and then pressing it back to the
‘
O
’
ring.
12
、
Check that the injector(8) fits into the bore of the cylinder and can
be moved up anddown without a feeling of tightness or grittiness.
Remove the injector.
13
、
Apply a smear of hydraulic oil to the outside of the piston and
insert into the cylinderand force it past the nose seal.
14. Lightly coat injector stem with hydraulic oil and insert into cylinder.
Press down so that lowermost
‘
O
’
ring on injector enters top of
cylinder.
15. Do not fit any further
‘
O
’
rings or the spring and cap at this stage.
9.3 Fitting Cylinder to Nose (refer to section
10.5 PAV20/20.06
Nose
Assembly)
1. Place nose assembly onto support tool that was used for the
dismantling operation. Insert cylinder assembly into nose with bolt
grooves in the cylinder in line with the bolt holes in nose.
2. Apply Loctite 242 or equivalent to the threads of the M12 (26) pinch
bolts and tighten to a torque of 41 Nm (30lb ft).
3. Fit new M12 Nyloc nuts (27) to projecting threads of pinch bolts (26)
and hand tighten using a wrench to hold the M12 pinch bolts (27).
9.4 Head Assembly (refer to section 10.7
PAV20/20.04 Head
Assembly, section 10.4 PAV20/20.03
Cylinder Assembly)
1. Discard all
‘
O
’
rings and seals and replace with new, but do not fit at
this stage.
2. Thoroughly wash all metal parts in an approved solvent cleaner
