1320/1620 Owner’s-Operator’s Manual
8/30/18
Page 9 of 19
1320H/1620B TILLER TROUBLESHOOTING GUIDE
CAUTION: ALWAYS USE EXTREME CARE WHEN TROUBLE SHOOTING OR MAKING
ADJUSTMENTS ON THE TILLER. STAY CLEAR OF TINES WHEN ENGINE IS
RUNNING. ALWAYS SHUT THE ENGINE OFF BEFORE DISASSEMBLING ANY
COMPONENT.
A. ENTIRE HYDRAULIC SYSTEM DOES NOT OPERATE AND THE ENGINE IS
NOT UNDER LOAD
1. Broken or improperly adjusted clutch
(actuator) cable.
2. Low hydraulic oil in tank.
3. Hydraulic pump-to-engine coupler has
slipped.
4. Hydraulic pump worn or tine motor relief
valve not functioning properly.
If broken, replace. Remove slack then
adjust for 7/16” to 1/2" movement at
actuator lever pin.
Fill to center of the 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 (at the T-fitting) of the hose that goes from the pump to the tank. Start the
engine and with the tines and wheels in neutral, pump off about four gallons of hydraulic oil into
a clean bucket. (The .52 CID pump, @ 1000 PSI & 3000 RPM, should pump at the rate of 6.5
GPM.) Replace the hose and remove the tank lid. Block the tines with a short 4 X 4 and stand to
the side.
With tines selected to ON (forward) rotation, squeeze the clutch lever 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 tine-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 tines in forward and
blocked, activate the system as before. The relief valve for the 1320H is set at 3000 pounds, and
3500 pounds for the 1620B. If the gauge reaches the specified pressure, the relief valve is OK.
If not, the relief valve is bad and needs to be replaced.
If the pressure reaches 3000 pounds but there is only a small amount of oil returning, the pump is
worn and should be replaced.
