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HYDRAULIC LIFT OPERATION
REEL/WING - LIFT SEQUENCE
Fig.11
Machines up to Serial No. 231.
Hydraulic oil pressure to the ‘RAISE’ circuit lifts the five
main reels first, followed by the wing reels and lastly the
wing frames.
The cylinders are ‘locked up’ by Pilot Check Valves.
The Pilot Check Valves are released by pressure on the
‘LOWER side of the hydraulic circuit.
REEL/WING - LOWER SEQUENCE
Fig.11
Hydraulic oil flow in the ‘LOWER’ circuit is stopped by
the Sequence Valve until the wing cylinders are fully
extended. Oil pressure is then sufficient to open the
Sequence Valve and ensure that the wing frames will
‘LOWER’ first, then the wing reels, followed by the main
reels.
Pilot Check Valves in the Valve Block remain ‘closed’
until pressure via the return lines opens them allowing
the return oil to escape from the cylinder. This prevents
the reels from ‘creeping down’ from the transport
position.
A Restrictor in the Check Valves prevents the wings
from ‘lowering’ too quickly.
17
Fig.11