Alamo MACHETE Product Service Manual page 167

POSSIBLE FAILURE / CAUSE & SOLUTION
Motor Over Heating:
CAUSE:
SOLUTION:
CAUSE:
SOLUTION:
CAUSE:
SOLUTION:
CAUSE:
SOLUTION:
Machete (Service Manual) 04/04
© 2004 Alamo Group Inc.
Excessive Internal Leakage in Pump / Motor?
Perform Flow and Pressure Test. If results are not within Specifications,
determine the cause of the internal leakage, correct the cause. Replace worn
or damaged parts. It is good to replace the Filter any time 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
un-noticed until 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 SPECIFIC, When performing the Flow Test on the
Machete, The flow going to the Motor and either the return from the Motor or the
Case drain must be determined. These figures will indicate internal leakage in
the Motor.
Relief Valve Malfunction?
Perform Flow Pressure Test. If Flow is correct and Pressure is Low, remove
Relief Valve and inspect for damaged Seals, Contamination or other abnormali-
ties. Re-Seal, Adjust or replace the Valve as needed. Leakage through the Valve
(from Low Pressure setting) or leakage around the Valve from damaged Seals
will cause heating of the Oil and Low Power complaints.
NOTE: There may be situations when Pump Flow is insufficient to reach Relief
Pressure. Therefore it is important the proper Flow be present before con-
demning the Relief Valve.
Restrictions in System?
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
disassembly. Unplanned restrictions cause increased backpressure, loss of
usable power and excess Heating of Oil. Restrictions can sometimes be found
by measuring the temp of the Oil (or fittings) at various points in circuit for higher
heat. The restriction should be located at or upstream of the increased temp.
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, a Component
such as a Hose built wrong.
Insufficient Flow From Charge Pump? (MACHETE SPECIFIC)
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.
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