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Coring Head Operating Problems
Problem Possible Causes
Coring head runs (but should not) when raised. Aeration #3 proximity switch is faulty or out of
adjustment.
Coring head does not lower. Fuse F3 (10 Amp) or F4 (2 Amp) is/are faulty.
Raise/lower switch is faulty.
SVL valve solenoid is faulty.
Aerator Control Module is faulty.
”OK to lower” circuit is not functioning (see OK to
Lower Circuit in Circuit Operation section of this
chapter).
Hydraulic problem exists (see Chapter 4 – Hydraulic
System).
Coring head does not raise. Fuse F3 (10 Amp) or F4 (2 Amp) is/are faulty.
Lift reset switch needs to be reset.
Raise/lower switch is faulty.
SVR or SVQ valve solenoid is faulty.
Aerator Control Module is faulty.
Hydraulic problem exists (see Chapter 4 – Hydraulic
System).
Electric clutch does not engage. Fuse F2 (10 Amp) is faulty.
Coring head is not lowered.
Clutch relay is faulty.
Aeration #3 proximity switch is faulty or out of
adjustment.
Circuit wiring to electric clutch is loose, corroded, or
damaged (see Chapter 8 – Electrical Diagrams).
Diode D3 is faulty.
Electric clutch is faulty.
Electric clutch is noisy. Clutch is loose on engine crankshaft.
Clutch strap is loose or damaged.
Broken leaf spring(s) on clutch.
Failed clutch bearing(s).
Clutch is slipping. Lubricant has contaminated clutch lining material.
Gap between clutch rotor and armature is excessive.
Electrical System
Page 5 – 10
ProCore 648