Alamo MACHETE Product Service Manual page 57

TROUBLE SHOOTING - TESTING
ISOLATION TEST 2:
1.
This Procedure applies to Units utilizing the Late Model Control Valve Assem-
blies used 1998 and up.
2.
Re-check to make sure all fluid levels are OK. The Control Valve Cover should
still be removed. Make sure that the Tractor Transmission is in Neutral and the
Park Brake is set and Holding, Test Park Brake before continuing. Make sure
that Boom and Cutting Head are resting on the ground.
3.
Locate the manual override control on Control Valve (See Figure 20) for the
Valve circuit that is malfunctioning (or you want to test). Each Section of the Valve
has manual override control.
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
FIGURE 20
4.
Start the Engine and let the Engine run at least 1000 RPM
5.
Using a 9 mm Open Wrench (See Figure 20) actuate the manual override
controls for the Circuit that is malfunctioning. Take note of the reaction of the
Circuit to all positions of the control. Also take note of the Smoothness of Spool
Operation. The Spool should move smoothly. If it doesn't it can indicate contami-
nation in the system or something wrong with Spool causing it to bind.
6.
If the Circuit fails to work with the Joystick and works properly with the manual
override control, The problem is in the Electrical Control Circuit, The Solenoid
Valve, Joystick or Wiring Harness or Pilot Pressure.
7.
If the circuit fails to work using the Manual Override Control, The Problem is in
the Control Valve, Hoses or Cylinder.
8.
Use this test to determine which components to test and/or trouble shoot.
Machete (Service Manual) 04/04
© 2004 Alamo Group Inc.
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57
Manual Override
Control use 9 mm
Hex Head Wrench
1 2 1 2
1 2
1 2 1 2