Haulotte Group HT21RT O, Maintenance Book

Page: 212 / 282

212 4000511390 E03.16 USA / GB
Upper boom
Procedure of dismantling / reassembling hydraulic rotary actuators
MS0028
8. Beginning with the inner seal ( 200 ) insert one end of bac-
kup ring in the lower groove and feed the rest in using a
circular motion. Make sure the wedged ends overlap cor-
rectly.
9. Insert the other back up ring in upper groove.
10. Repeat both of these steps for the outer seal ( 2 ).
11. Insert the piston ( 3 ) into the housing ( 1 ) as shown, until
the outer piston seal ( 202 ) contacts the inside housing
bore.
12. Looking into the housing bore from the shaft flange end,
rotate the piston ( 3 ) until the marks you put on the piston
and the housing ( 1 ) during disassembly align as shown.
Using a rubber mallet, tap the piston into the housing until
the gear teeth contact.
13. Looking into the bore from the opposite end of the
housing ( 1 ) be sure the timing marks align correctly Ro-
tate the piston as necessary until aligned, then gently tap
the piston ( 3 ) into the housing until the gear teeth mesh
together. Tap the piston into the housing until it comple-
tely bottoms out against the ring gear.