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14 ► GR29 User Manual
TROUBLESHOOTING
If symptoms of poor performance develop, the following chart can be used as a guide to correct the problem. When
diagnosing faults in operation of the grinder, always make sure the hydraulic power source is supplying the correct
hydraulic ow and pressure to the tool as listed in the table. Use a owmeter known to be accurate. Check the ow
with the hydraulic uid temperature at least 80 °F/27 °C.
PROBLEM CAUSE SOLUTION
Low performance. Incorrect hydraulic ow. Check that the power source is pro-
ducing 4–12 gpm/15–45 lpm at
1000–2000 psi/70–140 bar.
Defective quick disconnects. Check quick disconnects.
Fluid leaks at motor cap assem-
bly face.
Fasteners loose. Tighten to recommended torque
value.
Face O-ring worn or missing. Replace as required.
Motor cap assembly/main housing
damaged.
Replace as required.
Fluid leaks at reversing spool. Damaged O-rings. Replace as required. Refer to assem-
bly instructions to prevent cutting the
O-rings.
Wrong hydraulic uid. Circuit too hot. See Hydraulic System Requirements
for correct uid/circuit specications.
Hydraulic pressure and return re-
versed.
Correct hose connections.
Fluid gets hot, power unit work-
ing hard.
Open-center tool on a closed-center
circuit and vice versa.
Use tool to match circuit.
Too much uid going through tool. Adjust ow for 12 gpm/34 lpm maxi-
mum.
Circuit is generating high heat with ow
controls, open relief valve, etc.
Use pump size and rpm for produc-
ing needed ow only. Eliminate circuit
heating cause.
Circuit has contaminants that have
caused pump and valve wear and high
heat generation.
Replace worn pump and valves. In-
stall a large clean lter and keep cir-
cuit uid clean.
Tool doesn’t run. Power unit not functioning. Check that the power source is pro-
ducing 4–12 gpm/15–45 lpm at
1000–2000 psi/70–140 bar.
Coupler or hoses blocked. Remove obstruction.
Mechanical failure. Disassemble tool and inspect for
damage.
Tool runs backwards. Pressure and return hoses reversed. Correct for proper ow direction.
Grinding wheel should rotate counter-
clockwise when viewed from the shaft
end.
Grinding wheel comes to abrupt
stop after trigger is released.
Porting spool incorrectly assembled. Refer to Service Manual.
Check valve in trigger spool not func-
tioning correctly.
Replace trigger spool assembly.
Check valve not serviceable.
Mechanical failure. Disassemble tool and inspect for
damage.