Alamo MACHETE Product Service Manual page 172

POSSIBLE FAILURE / CAUSE & SOLUTION
Motor Stops: (Mower Quits)
CAUSE:
Low Relief Valve Setting?
SOLUTION:
Best Tested with Pressure / Flowmeter, Some Relief Valve can be Repaired, Some
Only Replaced, See Assembly set up instruction on Relief Valves, See Specification
Section on Relief valve Settings. DON'T exceed recommended Relief Settings. Before
condemning Relief Valve do a Flow and Pressure Test, The Pump under some
conditions can't build enough pressure to make the relief open and this would appear
Relief Valve is stuck, A Flowmeter will show when Pressure Relief opens.
CAUSE:
Restrictions in System?
SOLUTION:
Check Hoses / lines for Kinks / Obstructions. May not be visible without disassembly.
Unplanned restrictions cause increased back pressure, loss of usable power and
excessive heating of Oil (Usually at the restriction). Restrictions can sometimes be
found by checking different locations for the temperature, The restriction will generally
be upstream of heated spot. There are a number of things that can cause this heating
problem, Most common Problem, Contamination, Kinked or Damaged Hose,
Pump Seizure: (Pump Locking Up)
CAUSE:
Lack of Oil? (Lubrication)
SOLUTION:
This is normally caused by failure to Pre-Lube the Pump before starting or cavitation
(Air or Lack of Oil) during operation. A Lack of Pre-Lube failure will occur soon after start
up if Pre-Lube is not done when unit is assembled. Obstruction or damage to Intake
(Suction) Side of Pump or Lines can cause this problem. The solution would be to
determine what is damaged and why was Oil Low, Repair or Replace as required
CAUSE:
Improper Assembly?
SOLUTION:
Damage can be caused by over torquing the Pump components, incorrect alignment or
location of components. Improper Torquing or Assembly will normally show up very soon
after start up. The solution would be to determine what is damaged and why, Repair or
Replace as required
CAUSE:
Faulty - Defective Pump?
SOLUTION:
Sometimes Oil passages are not open inside the Pump during Manufacturing. These
problems will show up as early Bearing failures or Pump not working when installed and
very seldom occur after being run for awhile unless there is debris or other contamination
blocking something. The solution would be to determine damage, why, and Repair or
Replace as required
CAUSE:
Foreign Material? (Contamination)
SOLUTION:
Objects left in Tank or fall in during service. This can include, Dirt, Pieces of Hose, Plugs,
Rags or any other object can be left or get into system. Keep everything clean and
account for every thing used when serviced. The solution is to determine what is
damaged and why, Repair/ Replace as required.
Machete (Service Manual) 04/04
© 2004 Alamo Group Inc.
Continued
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