SP001751Hydraulic System Troubleshooting, Testing and Adjustment
Page 24
• Unloaded maximum engine speed baseline test (all
controls in neutral).
• Front pump test – operate "travel right" lever. Record
values at all specified pressures.
• Rear pump test – operate "travel left" lever. Record
values at all specified pressures.
Record the values for each of the three tests (neutral, travel right
and travel left) at the following pump pressure levels, with travel
speed control set at "high speed."
Compare recorded values with output shown in the P-Q curve in
the specifications section of this book.
If test results do not measure up to specified values, pump
output tests can be repeated using different control levers.
Recheck front pump operation while stroking the bucket cylinder
out lever, and the rear pump by actuating the swing control
lever.
NOTE: When testing bucket and swing functions, read
maximum flow tests at 330 kg/cm
2
(4,785 psi), not
350 kg/cm
2
(5075 psi).
Engine RPM Pressure Flow
100 kg/cm
2
(1,422 psi)
135 kg/cm
2
(1,930 psi)
180 kg/cm
2
(2,560 psi)
240 kg/cm
2
(3,413 psi)
320 kg/cm
2
(4,550 psi)*
*See below note.
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