Alamo MACHETE Product Service Manual page 164

POSSIBLE FAILURE / CAUSE & SOLUTION
Hydraulic System Overheating:
CAUSE:
Excessive Pump or Motor Wear? These will be accompanied by a Power Loss
when Mower Head is Cutting. Rapid Pump and/or Motor wear can be from damage
caused by Cavitation (restricted Oil Supply), Contamination, Aeration, or defects in the
Pump and Motor. Air Leaks (Air being sucked into system) causes Air Bubbles to be
entrained into the Oil. These Air Bubbles will reduce the lubricating ability of the Oil
causing adhesive wear to the Pump and Motor and a rapid increase in internal leakage,
Air entrained Oil will have a foamy look after the system has run for a while.
SOLUTION:
Test System for excessive Pump and Motor Wear or Cavitaion by running Pressure
and flow Test, Repair or Replace as required.
CAUSE:
Engine RPM Too High?
SOLUTION:
Run Tractor Engine at required Speed to achieve GPM through Pump, See Specifica-
tion Section in Repair Manual.
CAUSE:
Malfunctioning Valves? (Main Relief, Priority Valves and Logic Valves)
SOLUTION:
Test the above Valves, they are on the High Pressure Side of the system, these act
on a pressure differential and are spring loaded. The Typical failure is a Leaking Seal
between the Valve Cartridge and the Valve Block. An improper Low setting of Relief
Valve to Low a Pressure can cause rapid Heating as the Oil passes from the High
Pressure to the Low-Pressure area. The same is true for the other Spring Type Valves
such as the Priority Valve (Governors).
CAUSE:
Operational Problems? (Cutting Excessively Heavy Material, Traveling to Fast for
Conditions, Improper Cutting Height)
SOLUTION:
Make sure Cutting Height is not so low Blades are hitting Ground. Make sure that Travel
Speed while cutting does not exceed cutting capacity of Model Design. Make sure
something too heavy for this model is not being cut. Make Sure the Tractor Engine is
running at the correct RPM to run Hydraulics at the correct Speed. All of these can
cause Over Heating by forcing the system pressure over relief (causing Relief Valves
to Open and heating the Oil as it passes across the Valve). If the system pressure is
going over relief too frequently or for too long at a time, The Oil capacity will not be
sufficient to maintain the desired operating temperature. Travel Speed is always
dependent on the material being cut.
Motor Flange Breaking:
CAUSE:
Insufficient Support on Upper End of Motor?
SOLUTION:
1.
correctly, These Plates must be installed with clearance dimensions and Torque
settings, See the Spindle repair instruction in the Operators / Product Service Manual.
2.
kit made to add to these early units. Kit P/N 02970754 can be used to add Motor Plate
to Units made prior to 1996.
CAUSE:
Motor to Spindle retaining Bolts not Tight?
SOLUTION:
Check and Tighten Motor to Spindle Mounting Bolts.
Machete (Service Manual) 04/04
© 2004 Alamo Group Inc.
Make sure that the Motor Plate is installed on top of Motor and that it is installed
Some Units built prior to 1996 did not have this Motor Plate on it, There was a
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