Lift/Lower Circuit Problems
Problem
Possible Cause
Cutting decks will not raise.
Operator seat is unoccupied.
NOTE: Operator must be in seat in
Hydraulic oil level in reservoir is low.
order to raise the cutting decks.
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 in lift control manifold is stuck open.
Solenoid valve 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 decks raise, but will not stay
up.
Lift circuit hydraulic lines or fittings are leaking.
Cartridge valve in lift control manifold is stuck open.
Air exists in lift circuit.
NOTE: Lift cylinders cannot provide
an absolutely perfect seal. The lift
arms will eventually lower if left in
the raised position during storage.
Lift cylinder is damaged.
Cutting decks will not lower.
Operator seat is unoccupied.
Traction system is in high speed (2WD).
Lift arm pivots are binding.
NOTE: Operator must be in seat
and traction system must be in low
speed (4WD) in order to lower the
cutting decks.
Lift cylinder is damaged.
Proportional relief cartridge valve (TS) in lift control manifold is dam-
aged or sticking.
Groundsmaster 4500--D/4700--D
Page 4 -- 39
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Tags | Toro Groundsmaster 30857, Toro Groundsmaster 30858, Toro Groundsmaster 4500 D, Toro Groundsmaster 4700 D |
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| Document Type | Service Manual |
| Language | English |
| Product Brand | Toro. Customer Service Representatives are available by phone:
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| Publisher | toro.com |
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