WinGD RT-flex50DF, Maintenance Manual, Page: 175 / 586

Maintenance
2708 − 2/A1
Winterthur Gas & Diesel Ltd.
3/ 3
4. Apply Tension
1) Turn the round nuts (4, Fig. 3 ) fully
down.
2) Use a feeler gauge to make sure that
there is no clearance at the slot (5).
3) Put one reference mark (Y) on the
round nuts (4) and one reference
mark (X) on the parts below.
4) Attach pre-tensioning jacks (94252) on
the elastic studs as given in
paragraph 2 . Do not turn back the
round nuts.
5) Connect the pre-tensioning jacks
(94252) to hydraulic unit (94942)
6) Operate the hydraulic unit (94942).
7) Close the vent screws (7) when oil that
has no air flows out.
8) Operate slowly the hydraulic unit
(94942) to increase the pressure to
1500 bar. Keep the pressure constant.
9) Make sure that there are no leaks.
Note: Do not move the pistons (1) above
the limit of the red groove (2).
10) Use the round bar (6) to tighten the
round nuts (4).
11) Use a feeler gauge to make sure that
there is no clearance at the slot (5).
12) On the hydraulic unit, decrease the
pressure to zero.
13) Remove all pre-tensioning jacks.
14) Compare the angle between the
reference marks (X and Y). The
tightening angle must be 530
°.
If there
is a large difference, you must
investigate the cause and do the
procedure again.
Note: If one nut can be turned less than
the others, it can show that the
related elastic stud does not have
sufficient tension.
The possible causes are:
D The sealing rings (3) are defective.
D The piston (1) cannot move.
D The HP hose has a leak.
15) Do step 1 ) to step 14 ) again.
16) Make sure that all round nuts (4) are
turned equally to an angle of 530 _ .
2016
Cylinder Cover Elastic Studs − Loosen and Apply Tension
012.964/05
Fig. 3
1
2
3
4
6
5
X
Y
Marks for
Comparison
009.752/02
X
010.031/02
Tightening Angle 530
°
(One full turn of 360
°
,
plus 170
°
)
Y
7