Service Manual

Reelmaster 5200-D/5400-D Hydraulic SystemPage 4 - 15
Raise Cutting Units
A three section, gear pump is driven off the PTO output
shaft of the hydrostatic transmission. Pump section (P1)
provides oil flow through the hydraulic manifold to all five
cutting unit lift cylinders. Maximum c ircuit pressure
(3000 PSI) is limited by a relief valve in the manifold
block.
To raise the cutting units, solenoid valve (S7) is ener-
gized to direct pump flow through valve (S6) and valves
(S3), (S4), and (S5). Solenoid valve (S6) a normally
closed poppet-type valve, and the other three valves are
normally closed solenoid valves that control raising the
cutting units.
To hold the cutting units up in any position, all of the sole-
noid valves are de-energized. Valve (S6) is the load
holding valve.
The lift speed of the cutting units is regulated by 3 flow
control valves that are located in the hydraulic lines be-
tween the hydraulic manifold block and the lift cylinders.
The 250 PSI relief valve maintains a back pressure on
the lift cylinders. Excess flow is routed to the hydraulic
reservoir.
Hydraulic
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