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Reelmaster 7000Hydraulic System Page 4 -- 34
Lift/Lower Circuit Problems
Problem Possible Cause
Cutting units will not raise.
NOTE: Operator must be in seat in
order to raise the cutting units.
Operator seat is unoccupied.
Hydraulic oil level in reservoir is low.
Electrical problem exists that prevents lift control manifold solenoid
valve operation (see Chapter 5 -- Electrical System).
Lift cylinder(s) is (are) damaged.
Lift arm pivots are binding.
Lift/lower circuit relief valve (RV1) in lift control manifold is stuck
open.
Solenoid valve(s) in lift control manifold is damaged or sticking.
Flow divider (FD) in fan control manifold is faulty.
Gear pump section (P3) is worn or damaged (NOTE: A worn or dam-
aged gear pump section (P3) will also affect the traction (charge) and
steering circuits).
Cutting units raise, but will not stay
up.
NOTE: Lift cylinders cannot provide
an absolutely perfect seal. The lift
arms will eventually lower if left in
the raised position during storage.
Lift circuit hydraulic lines or fittings are leaking.
Cartridge valve in lift control manifold is stuck open.
Air exists in lift circuit.
Lift cylinder is damaged.
Cutting units will not lower.
NOTE: Operator must be in seat
and traction system must be in mow
speed (4WD) in order to lower the
cutting units.
Operator seat is unoccupied.
Mow speed limiter is in transport (2WD) position.
Electrical problem exists that prevents lift control manifold solenoid
valve operation (see Chapter 5 -- Electrical System).
Lift arm pivots are binding.
Lift cylinder(s) is (are) is damaged.
Lower circuit relief valve (RV2) in lift control manifold is stuck open.
Solenoid valve(s) in lift control manifold is damaged or sticking.