PRONAR T663/1 Operator's Manual page 89

SECTION 4
Unloading of the trailer is performed in the following sequence:
tractor and trailer must be placed to drive forwards on flat and hard ground,
immobilise tractor and trailer with parking brake; wheel chocks may be used to
provide additional protection,
if the load box tipping direction was not planned and set before, place tipping
pins (1) and (2) on the unloading side and secure them properly - figure (4.4),
if the load box tipping direction was planned and set before, check the position
of pin holders (3),
open (unlock) the lower locks of the walls on the unloading side and, possibly,
open the chute slide gate in the rear wall – figure (4.5),
open the load box wall locks connecting the wall with the post and the front
wall,
place the lever controlling the hydraulic tipping system circuits in position 1 --
tipping of the first trailer,
initiate tipping of the load box by activating the hydraulic circuit supplying the
hydraulic tipping system of the trailer.
after unloading, lower load box, remove the residual material from the load
box edges and walls,
close and secure the walls and wall extensions or chute opening,
before moving off, make sure that the tipping pins are in correct position and
are protected with cotter pins.
pins and individual sockets are designed so it is impossible to place
them on the opposite diagonal side of the load box, which would
damage the trailer,
holder (3) of correctly locked front pin is vertical (directed downward),
holder (3) of correctly locked rear pin is directed sideways – figure
(4.4),
exercise caution while opening these components,
exercise caution while opening these components,
4.23
Pronar T663/1 T663/1 SILO