Haulotte Group HT21RT O, Maintenance Book

Page: 206 / 282

206 4000511390 E03.16 USA / GB
Upper boom
Procedure of dismantling / reassembling hydraulic rotary actuators
MS0028
11. Remove the shaft ( 2 ) by rotating counterclockwise. As
the shaft is rotated, it will disengage from the piston
sleeve ( 3 ) and can be removed. It may be necessary to
strike the threaded end of the shaft with a rubber mallet.
12. As in step 9 above, before removing the piston ( 3 ), mark
the housing ( 1 ) ring gear in relation to the piston outside
diameter gear. There should now be timing marks on the
housing ( 1 ) ring gear, the piston ( 3 ) and the shaft ( 2 ).
13. To remove the piston ( 3 ) use a rubber mallet and a plas-
tic mandrel so the piston and housing bore are not dama-
ged.
14. At the point when the piston gear teeth come out of enga-
gement with the housing gear teeth, mark the piston and
housing with a marker as shown.