A. ENTIRE HYDRAULIC SYSTEM DOES NOT OPERATE AND THE ENGINE IS NOT
UNDER LOAD
1.
2.
3.
4.
RH918 ROTARY HOE TROUBLE SHOOTING GUIDE
CAUTION: ALW AYS USE EXTREME CARE WHEN TROUBLE SHOOTING OR MAKING
ADJUSTMENTS ON THE ROTARY HOE.
STAY CLEAR OF TYNES WHEN ENGINE IS
RUNNING
. ALWAYS SHUT THE ENGINE OFF BEFORE DISASSEMBLING ANY
COMPONENT.
Broken or improperly adjusted clutch
(actuator) cable.
Low hydraulic oil in tank.
Hydraulic pump-to-engine coupler
has slipped.
Hydraulic pump worn or tyne motor
relief valve not functioning properly.
Fill to centre of sight glass.
Check for wear and replace both coupler
halves and rubber spider as needed.
Follow the series of tests described below:
Remove the tank end of hose that goes from the pump to the tank. Start the engine and with
the tynes and wheels in neutral, pump off about four gallons of hydraulic oil into a clean bucket.
(The .52 CID pump, @ 1000PSI & 3000 RPM, should pump at the rqate of 6.5 GPM). Replace
the hose and remove the tank lid. Remove the end of the intake hose from the fitting on the
tank lid. Submerge the end of the hose in the hydraulic oil in the tank. (A non-collapsible
hose extension may be required ). Block the tynes with a sort 4 X 4 and stand to the side.
With tynes selected to forward rotation, activate the actuator valve and check to see where
the oil enters the tank. If the pump is good, the oil will enter through the relief valve or the
return line from the filter. If the oil returns only through the filter return, the tyne drive motor is bad.
If the oil returns through the relief valve but does not kill the engine, check the out-put pressure
of the pump. To do this, “T” a 4000 pound gauge into the line at the tank.
DO NOT BLOCK
THE LINE OR DEAD-HEAD THE GAUGE INTO THE LINE.
With the tynes in forward and blocked,
activate the hydraulic valve as before. The relief valve is set at 2750 pounds. If the gauge
reaches this pressure, the valve is OK. If not, the relief valve is bad and needs to be replaced.
If the pressure reaches 2750 pounds but there is only a small amount of oil returning, the pump
is worn and should be replaced.
If broken, replace. Remove slack then
adjust for 7/16” to 1/2” movement at
actuator lever pin.
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