Maintenance
9403−4/A1
Winterthur Gas & Diesel Ltd.
3/ 4
3. Apply Tension
1) Turn the round nut (4) fully down (Fig. 1 and Fig. 2). Make sure that there is no
clearance at the slot (10).
2) Put one reference mark (Y) on the nut and one on the part below (X) (see Fig. 3
and Fig. 4).
X
Y
009.752/02
X
010.031/02
TIGHTENING
ANGLE
Y
MARKS FOR
COMPARISON
Fig. 3
Fig. 4
3.1 Version 1 − Preparation
1) Make sure that the vent screw (6) is open (see Fig 1).
2) Put the hydraulic jack on the elastic stud (5).
3) Turn the hydraulic jack until it is tight. Make sure that there is no clearance at X.
3.2 Version 2 − Preparation
1) Put the hydraulic jack over the elastic stud (5).
2) Use the round bar to lightly tighten the round nut (3).
Note: If necessary, turn back the hydraulic jack a small distance to get access
to the hole in the nut (3).
3.3 Procedure
1) On the HP oil pump, close the relief valve.
2) Connect the hydraulic jack to the HP oil pump or the hydraulic unit.
3) Operate the HP oil pump.
4) Close the vent screw (6) when oil that has no air flows out.
5) Slowly increase the pressure to the nominal value, then keep the pressure
constant (see the Table for the pressure values)
6) Make sure that there are no leaks.
7) Operate the HP oil pump to slowly increase the pressure to approximately 20 bar
to 30 bar more than the value give in Table 1.
Note: Do not move the piston (2) above the limit of the red groove (9).
8) Use the round bar (8) to tighten the round nut (4) nut.
9) Put the feeler gauge through the slot (10) to make sure that there is no clearance
between the round nut (4) and the seating.
10) Compare the angle between the reference marks (X and Y) on the round nut (4)
and the Comparison value in the Table. If there is a large difference, you must
investigate the cause and do the procedure again.
11) On the HP oil pump,or hydraulic unit, decrease the pressure to zero.
12) Remove the hydraulic jack.
Hydraulic Pre-tensioning Jacks: General Instructions
2015
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