Maintenance9403−4/A1
Winterthur Gas & Diesel Ltd.
2/ 4
2. Loosen
2.1 Version 1 − Preparation
1) Make sure that the vent screw (1, Fig. 1) is open.
2) Put the hydraulic jack on to the elastic stud (6).
3) Turn the hydraulic jack until it is tight. Make sure that there is no clearance at X.
2.2 Version 2 − Preparation
1) Make sure that the vent screw (1) is open (see Fig. 2).
2) Put the hydraulic jack over the elastic stud (6).
3) Use the round bar to lightly tighten the round nut (7).
2.3 Procedure
1) Turn back the round nut (7), or the hydraulic jack (see Table 1 below).
2) On the HP oil pump, close the relief valve.
3) Connect the hydraulic jack to the HP oil pump or the hydraulic unit.
4) Put a hose on the vent screw (1)
5) Put a container below the hose to drain the oil.
6) Operate the HP oil pump.
7) Close the vent screw (1) when oil that has no air flows out.
Note: Do not move the piston (2) above the limit of the red groove (3).
8) Operate the HP oil pump to slowly increase the pressure to between
approximately 20 bar to 30 bar more than the value give in Table 1.
9) Keep the pressure constant and use the round bar (8) to loosen the round nut (7)
(see Table 1 below).
10) On the HP oil pump, or the hydraulic unit, decrease the pressure to zero.
11) Remove the hydraulic jack.
Version 1
016.696/08
x
2
8
APPLY TENSION LOOSEN
Version 2
016.697/08
x
APPLY TENSION LOOSEN
Fig. 1 Fig. 2
1
4
5
3
9
6
7
5
1
2
4
3
8
6
7
9
10
Hydraulic Pre-tensioning Jacks: General Instructions
2016
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