Toro Groundsmaster 7210, Service Manual

Page: 112 / 342

Perform the gear pump flow test if you identify a cutting deck (or implement)
raise and lower problem. This test determines if the hydraulic flow from the
gear pump is correct.
Test Procedure
Note: Over a period of time, the gears and wear plates in the gear pump can
wear. A worn pump may bypass the hydraulic fluid and make the pump less
efficient. After some time, sufficient fluid loss might occur and cause the cutting
deck lift cylinder to operate slowly. Optional hydraulic cylinders and motor, if
equipped, will also lose efficiency. Continued operation with a worn, inefficient
pump can generate excessive heat, cause damage to the seals and other
components in the hydraulic system.
1. Ensure that the hydraulic fluid is at normal operating temperature.
2. Ensure that the traction drive is correctly adjusted for the N
EUTRAL
position.
WARNING
Before disconnecting or doing any work on the hydraulic system,
release all the pressure in the system; refer to
Releasing Pressure
from the Hydraulic System (page 4–11) .
g033408
Figure 49
1. Lift control manifold 2. Hose from the gear pump
3. Park the machine on a level surface, lower the cutting deck (or implement),
shut off the engine, and set the parking brake.
4. Read all Warning, Cautions, and precautions listed at the beginning of this
section.
5. Clean the junction of the hydraulic hose and upper fitting on the front of the
lift control manifold.
6. Disconnect the hydraulic hose from the upper fitting on the front of the lift
control manifold ( Figure 49 ). This hose is from the gear pump outlet and
provides fluid flow to the lift control manifold.
7. Install a hydraulic tester (pressure and flow) in series with the gear pump
fitting and disconnected hose. Ensure that the tester flow arrow points from
the pump outlet port and toward the disconnected hose. Ensure that the
flow-control valve on the tester is fully open.
Hydraulic System: Testing the Hydraulic System Page 4–52 Groundsmaster 7210
16222SL Rev C