HYDRAULIC DRIVE SYSTEM
6-93Toro GrandStand Service Manual
6
13. Run the machine for 2 minutes in forward (no load)
to purge air from the system.
14. Run the machine at full throttle (no load). Verify the
RPM with a tachometer: 3200 + 150 RPM. Do not
exceed 3600 RPM.
15. With the drive control fully forward, slowly tighten the
restriction valve until the gauge indicates 300 PSI
(21 bar) (Fig. 1240).
16. Record the ow reading from the bi-directional ow
meter. Make a second ow reading at 1100 PSI and
record that reading (Fig. 1241). Subtract the rst
reading from the second reading and determine if it
is an acceptable GPM.
Fig. 1240 IMG-0921a
Fig. 1241 IMG-0920a
Example:
1st Reading: 300 psi (21 bar) reading 7 gpm (26 l/m).
2nd Reading: 1100 psi (76 bar) reading 3 gpm (11 l/m).
7 gpm (1st reading)
- 3 gpm (2nd reading)
4 gpm (the difference)
Refer to the Hydro-Gear pump service manual for maxi-
mum acceptable “ow droop”, or difference.
Note: Disassemble and inspect the wheel motor
if the pump is damaged due to mechanical
failure, excessive wear, or the hydraulic uid
is overheated or contaminated in any way.
Flush or replace hydraulic lines and reservoir
to remove any contamination.
To Next Page
Loading...
