Priming Hydraulic Pumps - Toro Groundsmaster 4500-D Series Service Manual

Priming Hydraulic Pumps

Hydraulic System: Service and Repairs
Whenever the hydraulic system is flushed, the hydraulic system is charged or
hydraulic components are installed, it is important to properly prime the hydraulic
pumps. Hydraulic pump priming ensures that the gear pump and piston (traction)
pump have adequate oil during initial start−up and running. The pumps can be
primed by using a remote starter switch (see
engine which allows the pumps to prime.
Use the following procedure to prime the hydraulic pumps:
1. Make sure that ignition switch is in the OFF position and key is removed
from switch.
g275416
1. Starter motor
2. Starter solenoid
2. Check hydraulic reservoir oil level and adjust if necessary.
Note: A blue wire connects to the starter motor solenoid B+ terminal
94). It is not necessary to remove this blue wire from the solenoid terminal
for hydraulic pump priming.
3. Connect remote starter switch electrical leads to the starter motor solenoid
B+ terminal and the positive post of the battery.
4. Engage remote starter switch and crank starter for thirty (30) seconds to
prime hydraulic pumps. Wait thirty (30) seconds to allow the starter motor
and starter solenoid to cool. Repeat cranking procedure a second time.
5. Disconnect remote starter switch leads from starter motor solenoid terminal
and positive post of the battery.
Special Tools (page
3
1
Figure 94
3. B+ terminal
Page 5–90
2–16)) to crank
2
(Figure
Groundsmaster ® 4500-D/4700-D
19245SL Rev A