Filter
Top Products
HYDRAULIC LIFT OPERATION
REEL/WING - LIFT SEQUENCE
Fig.10.
From Serial No. 232. (See Fig.11 for earlier machines)
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.10
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 return oil
to escape from the cylinder. This prevents the reels from
‘creeping down’ from the transport position.
Restrictors in the wing cylinders prevent the wings from
‘lowering’ too quickly.
Fig.10
16