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Reelmaster 5010- HHydraulic System Page 4 - 28
Lift Circuit Problems (Continued)
Problem Possible Cause
None of the front cutt ing units will
raise or lower but the rear cutting
units will raise and lower
Solenoid valve SV1 on lift control manifold is faulty.
An electrical problem exists that prevents SV1 solenoid coil on the
lift control manifold from being energized (see Troubleshooting in
Chapter 5 - Electrical System).
Neither o f the rear cutting units will
raise or lower but the front cutting
units will raise and lower
Solenoid valve SV3 on lift control manifold is faulty.
An electrical problem exists that prevents SV3 solenoid coil on the
lift control manifold from being energized (see Troubleshooting in
Chapter 5 - Electrical System).
Flow control orifice in lift control manifold for the rear cutting units
(C23 or C23L) is plugged or damaged.
Check valve in lift control manifold for the rear cutting units (CV23)
is stuck or damaged.
Single cutting unit lowers very slowly
or not at all
Lift arm or lift cylinder for the affected cutting unit is binding.
Lift cylinder for the affected cutting unit is damaged.
Flow control orifice in lift control manifold for the affected cutting
unit is plugged or damaged.
Check valve in lift control manifold (CV1, CV4, CV5 and CV23) is
stuck or damaged.
Steering Circuit Problems
Problem Possible Cause
Steering inoperative or sluggish Steering components (e.g. tie rods, steering cylinder ends) are
worn or binding.
Steering cylinder is binding.
Oil level in hydraulic reservoir is low (other hydraulic systems af-
fected as well).
Steering relief valve (R10) in steering control valve is stuck or dam-
aged.
Steering cylinder leaks internally.
Steering control valve is worn or damaged.
Internal gear pump drive coupler is damaged.
Gear pump section (P2) is worn or damaged (NOTE: A worn or
damaged gear pump section (P2) will also affect the traction
(charge) circuit).