Cutting Unit(S) Will Not Raise - Toro Reelmaster 5100-D Service Manual

Cutting Unit(s) Will Not Raise

Cause
__ ________________________________________________________________________________________
One-way variable orifice closed - center and rear
cutting units only - see Hydraulic Schematics.
_____________________________________________ ________________ ______ ________________ ______ ________________ ___________________________________
Engine RPM too low.
_____________________________________________ ________________ ______ ________________ ______ ________________ ___________________________________
S7 not shifting.
_____________________________________________ ________________ ______ ________________ ______ ________________ ___________________________________
S3, S4, or S5 not shifting (See Hydraulic Schemat-
ics to see which valve controls what lift cylinders.)
_____________________________________________ ________________ ______ ________________ ______ ________________ ___________________________________
R1 bypassing.
_____________________________________________ ________________ ______ ________________ ______ ________________ ___________________________________
Internal leakage in lift cylinder(s).
_____________________________________________ ________________ ______ ________________ ______ ________________ ___________________________________
Lift arm pivots binding.
_____________________________________________ ________________ ______ ________________ ______ ________________ ___________________________________
P1 pump section inefficient.
Troubleshooting
__ __ __
__ __ __
__ __ __
__ __ __
__ __ __
__ __ __
__ __ __
Page 4 - 22
Correction
Open speed control valve.
__ __
Increase engine RPM to operating speed.
__ __
Do electrical diagnostics to make sure that voltage
is being applied to S7 and that there is no electrical
fault. See Chapter 5 - Electrical System.
Test solenoid coil. Replace if faulty. See Chapter 5 -
Electrical System.
Oil viscosity too high - run machine to warm up oil to
operating temperature.
Do cartridge valve service procedure for valve S7.
__ __
Do electrical diagnostics to make sure that voltage
is being applied to solenoid for affected circuit and
that there is no electrical fault. See Chapter 5 - Elec ­
trical System.
Test solenoid coil for valve of affected circuit. Re­
place if faulty. See Chapter 5 - Electrical System.
Do cartridge valve service procedure for valve in af ­
fected circuit.
Interchange solenoid from affected circuit with an ­
other similar valve (S3, S4, or S5) and check opera­
tion. Replace or repair affected valve if faulty.
__ __
Check relief pressure at port G1 of valve block and
adjust valve if necessary.
Do cartridge valve service procedure for valve R1.
Replace R1 with a new valve.
__ __
Check lift cylinder(s) and repair or replace if faulty.
__ __
Lubricate bushings. Inspect for damage. Repair or
replace damaged parts.
__ __
Repair or replace pump.
__
__
__
__
__
__
__
®
Reelmaster 5100-D