Maintenance9403−4/A1
RT-flex58T-E
Winterthur Gas & Diesel Ltd.
4/ 6
2.2. Loosening procedure −> jack with control pin
⇒ Thread the jack with opened vent screw 4 onto the extending thread end of
bolt 5 to be loosened until it is landed on the part and piston 2 on cylinder 1 if
possible without clearance at ’x’.
⇒ Reset, i.e. turn the jack (or the nut of 94215A) correspondingly back (see
table).
D The clearance ’SA’ thus obtained between jack and landing surface of the part
or piston and cylinder is essential. It enables the loosening of the nut until total
relaxation of the bolt in one single working sequence.
⇒ Shut relief valve (’EV’) at the HP oil pump.
⇒ Connect the jack to the HP oil pump or hydraulic unit and actuate the latter.
Close vent screw 4 as soon as oil flows out bubble-free.
⇒ Slowly raise the pressure approx. 20...30 bar beyond the nominal pressure
(see table). The nut is now slack, loosen it correspondingly with round bar
’RS’, while keeping the pressure constant.
Control pin ’CP’ must always protrude over the top edge of piston 2. When the pin is
flush with the top edge of the piston the maximum stroke of the piston is reached.
Therefore do not continue to operate the pre-tensioning jack!
⇒ Release the pressure at HP oil pump or hydraulic unit to zero and remove the
jack.
PRE-TENSIONING JACK SCREWED ON FOR
TENSIONING LOOSENING
B
x
4
CP
KO
RS
1
2
SA
3
6
5
PROTRUDING
2013
Hydraulic Pre-tensioning Jacks: General Application Instructions Jack with Control Pin
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