Alamo MACHETE Product Service Manual page 171

POSSIBLE FAILURE / CAUSE & SOLUTION
Motor Stops: (Mower Quits Under Load)
CAUSE:
Incorrect Oil Used?
SOLUTION:
Use recommended Hydraulic Oil, DO NOT mix Oils that are not compatible, in some
cases it may be required to drain and replace all the oil. See Specification Chart for
recommended Oil Type. When repairing unit it is recommended that Oil is updated
to recommended Oil.
CAUSE:
Air In Oil?
SOLUTION:
Run the System for a few minutes. Check for Air in the Oil in the Tank. Air entrained
Oil will have a foamy appearance. If Air is present, find the Air Leak and correct it. Air
Leak can be in the Suction Line and Oil may not leak out because there may only be
Oil in that location when the Pump is sucking it in. With the Tractor Engine Off you
can find a leak by pressurizing the Tank, This will not take but a few pounds of
pressure (10 PSI or Less) look for leakage in the Suction Lines, Because the Oil Pick-
Up is lower than the Oil Level this will force Oil out the leak. Leaks in Hoses and at
Fittings can draw Air into System as Oil Flows Past. Systems that have had severe
or prolonged Air Entry Problems may have Experienced Pump Damage.
CAUSE:
Engine RPM Too Slow?
SOLUTION:
Run Tractor Engine at required Speed to achieve GPM through Pump, See Speci-
fication Section in Repair Manual.
CAUSE:
Excessive Ground Speed For Mowing Conditions? (Operational Problem)
SOLUTION:
This will usually also have a Heating Problem if continuing to mow. Observe (or Ask
Operator) mowing conditions, Material being Cut etc. Correct Ground Speed is
always relative to Material and conditions of mowing. One indication of Excessive
Ground Speed is considerable wear on tips of blades but this is not exclusive of
Excessive Ground Speed as the Wear can be caused by other factors. So Blade
Wear alone is not definite Travel Speed problem. The Cut is Choppy and uneven, the
material is coming from under deck in Lumps instead of distributed across width of
Deck. These conditions can force the Oil to go over relief because of excessive Load
on Motor. A Change of Ground Speed and/or application will cure this problem.
CAUSE:
Excessive Internal Leakage in Pump / Motor?
SOLUTION:
Perform Flow / Pressure Test. If results are not within Specifications, determine
cause of the internal leakage, correct the cause. Replace worn / damaged parts. It
is good to replace the Filter anytime the Pump and/or Motor are repaired or replaced.
Pump and/or Motor wear usually occurs over a long period and are gradual loss of
power and excess heating of Oil. This may go unnoticed till it is severe making the
operator think it just started, this can make this type of failure hard to determine. Pre-
Mature Pump and/or Motor Failure wear occurs quickly, The problem for these
failures must be found and repaired or the failure will be repetitive. The Most common
cause of Pre-Mature Failure is Cavitation, Oil Contamination, Oil Aeration and/or
Defects in Pump and/or Motor.
Machete (Service Manual) 04/04
© 2004 Alamo Group Inc.
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