Testing The Traction Circuit-Charge Pressure (Machine Serial Numbers Above 316000000) - Toro Groundsmaster 3280-D Service Manual

Testing the Traction Circuit–Charge Pressure (Machine Serial
Numbers above 316000000)
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Test Procedure
Groundsmaster ® 3280-D/3320
05138SL Rev B
The charge pressure test is the first in a series of tests recommended to
determine traction circuit performance. A charge pressure drop of more than
20% indicates an internal leak in the hydraulic pump. Continued unit operation
can generate excessive heat, cause damage to seals and other components in
the hydraulic system, and affect overall machine performance.
Special Equipment Required: Pressure gauge
1. Warm oil after test equipment is connected to prevent technician from
working on a hot machine—applicable to tests when possible (any test that
requires an open un-pluged/capped line (case drain tests) would not apply
and oil should be warmed before disconnecting the lines).
Before opening the hydraulic system, operate all the hydraulic
controls to release system pressure and avoid injury from the
pressurized hydraulic fluid; refer to
Hydraulic System (page
2. Park the machine on a level surface with the PTO switch off, lower the cutting
deck, shut off the engine, and set the parking brake.
Figure 67
CAUTION
Releasing Pressure from the
5–6).
Page 5–59 Hydraulic System: Testing the Hydraulic System