Alamo MACHETE Product Service Manual page 169

POSSIBLE FAILURE / CAUSE & SOLUTION
Motor Runs Too Slow:
CAUSE: Engine RPM Too Slow?
SOLUTION: Run Tractor Engine at required Speed to achieve GPM through Pump, See Specifica-
tion Section in Repair Manual.
CAUSE: Pump Drive Damaged?
SOLUTION: Inspect Pump Drive components for wear or damage, If Pump is not being driven
CAUSE: Faulty Logic Valve in Motor Control Circuit? (If Equipped)
SOLUTION: Remove and inspect Logic Cartridge for damaged seals or contamination, Repair,
Reseal or Replace as needed. If the Seals on the Logic Valve repeatedly fail, it will likely
be required to replace the Valve Block due to damage or erosion in the Valve Bore.
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: Restrictions in System?
SOLUTION: Check Hoses / Lines for Kinks/Obstructions. Hoses have inner linings that can turn
loose to block it. If Assembly or Repair work has been performed, recheck all
connections for correct location. Some may not be visible without some dis-assembly.
Unplanned restrictions cause increased backpressure, loss of usable power and
excess Heating of Oil. Restrictions can sometimes be found by measuring the
temperature of the Oil (or fittings) at various points in circuit for higher heat. The
restriction should be located at or upstream of the increased temperature point.
Foreign objects sometimes cause restrictions in the system, This can happen
during servicing, maintenance or repairs. It is not uncommon to find bolts, nuts, plastic
plugs, paper or rags stuck into system when it was used as being repaired or
assembled then forgotten about. Restrictions sometimes can be a piece off of a failed
component up stream, Component such as a Hose built wrong.
CAUSE:
Damaged O-Ring on Solenoid Valve? (If Equipped)
SOLUTION:
Remove Valve and inspect Seals, replace if damaged.
CAUSE:
Insufficient Flow From Charge Pump? (MACHETE SPECIFIC)
SOLUTION:
Measure Flow from charge Pump (Install Flowmeter in series upstream of Charge
Filter). If Flow is significantly less than 6 GPM at rated RPM. Replace the Pump
Assembly and retest for proper Flow.
Machete (Service Manual) 04/04
© 2004 Alamo Group Inc.
properly, repair or replaced parts as required.
(Continued)
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