Alamo MACHETE Product Service Manual page 157

POSSIBLE FAILURE / CAUSE & SOLUTION
Cylinder Won't Move Under Load:
CAUSE:
Obvious Causes Check First? (Check These First)
SOLUTION:
Perform all Operational checks, Tank Oil Level, Pump Operation, Control Valve
Circuit (Electrical Supply & Hydraulic Supply), All Circuits affected or only some
Circuits. If All Circuits will not work the Problem is most likely up-stream of the
control Valve or an electrical Problem (Models with Joystick Controller). The
Following Causes are based on only some circuits being affected, Not all Circuits.
CAUSE:
Incorrect Hose Routing? (Unit has never worked or been repaired)
SOLUTION:
Check Hose Routing with Parts Manual and Assembly Guide to make sure Hoses
Are routed correctly. Move and reconnect Hoses as required.
CAUSE:
Work Port Relief Installed Improperly? (Unit has never worked or has been
repaired or worked on)
SOLUTION:
Determine correct positioning of Work Port Relief's. If reliefs are incorrectly
installed, Install correctly and Test.
CAUSE:
Work Port Relief Malfunction?
SOLUTION:
Determine if one or both sides are affected. Make sure Work Port Relief's are in
proper position, Swap Hoses with another circuit or swap Work Port relief's with
another circuit to determine where problem lies. Repair or replace faulty Parts as
required.
CAUSE:
Control valve or Remote Control Malfunction?
SOLUTION:
Observe actuation of Valve Spool in relation to Control Lever. Repair any faults.
CAUSE:
Restrictions in System?
SOLUTION:
Check Hoses and Lines for Kinks / Obstructions. Hoses have an inner lining that
can turn loose and block a hose. 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, excess Heating of Oil and failure of Shaft Seals.
Restrictions can sometimes be found by measuring the temperature of the Oil (or
fittings) at various points in circuit as heat will usually be higher at the restriction. The
restriction should be located at or upstream of the increased temperature point.
Restrictions are sometimes caused by foreign objects that get into 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 being
repaired or assembled then forgotten about.
Restrictions sometimes can be a piece off of a failed component up stream or a
Component such as a Hose built wrong.
Machete (Service Manual) 04/04
© 2004 Alamo Group Inc.
157
(Moves Slowly)