WinGD WARTSILA RT-flex58T-E, Maintenance Manual

Page: 465 / 504

Maintenance
9403 − 4/A1
RT-flex58T-E
Winterthur Gas & Diesel Ltd.
5/ 6
3. Working procedure for tensioning
3.1 Tensioning procedure − > jack with limiting groove
⇒ Firmly tighten nut 6 with round bar ’RS’.
Check with a feeler gauge through slot ’KO’ whether actually no clearance remains
between nut and seating.
⇒
Use a felt pen to mark the position of the nut against its landing (Fig. ’C’); the
mark is later a reference for judging the correct tensioning.
⇒ 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’.
⇒
The jack must not be reset, i.e. turned back for tensioning.
D It may be necessary to turn the jack back a little to gain easy access through
the slot in the cylinder lower part for manipulating round bar ’RS’ to tighten the
nut.
⇒ 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 to the nominal value and keep it constant (see
table). Use round bar ’RS’ to tighten the nut onto its landing until firmly seated.
Never move piston 2 of the pre-tensioning jack further up than to the red limiting
groove ’BN’ (Fig. ’A’).
Check with a feeler gauge through slot ’KO’ whether actually no clearance remains
between nut and seating.
Check with the referenced mark, whether the nut of a screwed connection has
been turned by the same value (Fig. ’D’) as mentioned in the table (comparison
value). If big differences are noted their causes have to be investigated and the
tensioning procedure must be repeated.
⇒ Release the pressure at HP oil pump or hydraulic unit to zero and remove the
jack.
x
y
009.752/02
x
010.031/02
TIGHTENING
ANGLE
y
C D
MARKS FOR
COMPARISON
2013
Hydraulic Pre-tensioning Jacks: General Application Instructions Jack with Limiting Groove
CHECK
CHECK