6
Hydraulic Ram
6.1
General Description.
Multi-Tip bin-tippers use a single-acting displacement-type hydraulic ram, which requires very
little maintenance. There is no piston, just a seal in the head which seals onto the chrome-bar
spear.
A
‘hose
-
burst valve’ is fitted at the port, which locks the ram if the hydraulic hose should burst.
6.2
Removal and Refitting
I.
Lower the cradle fully, and then remove the upper and lower ram covers.
II.
Undo the hydraulic hose fitting at the bottom of the ram.
III.
Disconnect the chain from the adjusting bolt and tie it to the mesh guard to stop it falling
down inside the mast.
IV.
Loosen the ram adjustment screws.
V.
Lift the ram out of the bracket, carefully feeding the port through the cut-outs in the mast
and bracket.
VI.
Refitting is a reversal of the above procedure.
VII.
Extend the ram fully, ensuring it is centred between the rams stops, then tighten the
adjustment screws.
6.3
Dismantling and Servicing
I.
Hold the ram body horizontally in a vice, with the roller end raised slightly.
II.
Pull the chrome-bar spear right out of the ram body, and lay aside, taking care not to
damage the chrome surface.
III.
Take the ram body out of the vice, and pour the small amount of remaining oil into a
suitable container for disposal.
IV.
If the seal has been leaking, pick it out of its groove near the end, using a small, sharp
screwdriver.
V.
If there is a pinhole leak in a weld, it is generally best to fit a complete replacement ram
body, and return the faulty one to Simpro for repair. If this is not feasible, mark the
location of the hole, and grind a groove at least 3mm deep, and 10mm each side of the
hole. If possible, weld using MIG or arc welder. If a welder is not available, it may be
