Attachment/Loader Circuit Testing – Gear Pump (P3) Flow Test
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Figure 31
Gear Pump (P3) Flow Test
A gear pump flow test should be performed to make sure that the circuits being
supplied by the pump have adequate hydraulic flow. Over time, the gears and
wear plates in a gear pump can wear. A worn pump will by-pass oil and make
the pump less efficient. Eventually, enough oil loss will occur to cause circuit
problems (e.g. attachment performance issues or the loader stalling when
lifting heavy loads). Continued operation with a worn, inefficient gear pump can
generate excessive heat and cause damage to seals and other components in
the hydraulic system.
IMPORTANT
To prevent hydraulic tester damage, use a 57 LPM (15 GPM) Hydraulic
Tester (pressure and flow) and additional hoses and fittings for this
test; refer to
Special Tools (page 2–14)
.
1. Park the machine on a level surface, lower the attachments and stop the
engine. Remove the key from the key switch.
Outcross 9060
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Hydraulic System: Testing the Hydraulic System
18234SL Rev B
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