3
PREPARATION OF TRACTOR
3.1 Tyres
Ensure that all are at the manufacturer's recommended pressures and that
left and right hand side tyre pressures are identical. (See Manufacturer's In-
structions)!
3.2 Lift Rods
Adjust lift rods to equal length. Where there are alternative positions for the
lift rods on the lower links, use the rearmost position, to unload the tractor hy-
draulics. (See Manufacturer's Instructions).
3.3 Check Chains or Sway Blocks
Check chains or sway blocks MUST be adjusted so that the lower links can
move sideways a little during work.
3.4 Hydraulic equipment
For the hydraulic equipment of the seed drill the following tractor spool valves
must be available:
Hydraulic harrow lifting device
Hydraulic coulter pressure adjust-
ment (only with suffolk coulters and
single disc coulters)
Hydraulic pre-emergence marker
single acting (with track marker)
Hydraulic pre-emergence marker
single acting (without track marker)
Hydraulic remote control for seed
rate adjustment
* with pressureless return pipe or alternatively a double acting spool valve
3.5 Tractor hydraulics
For work the hydraulics must be set to position control.
16
Required spool valves
single acting
1
1
1
1*
1
double acting
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