Charging The Hydraulic System - Toro Groundsmaster 4300-D Service Manual

Charging the Hydraulic System

Hydraulic System: Service and Repairs
Note: When initially starting the hydraulic system with new or rebuilt components
such as pumps, wheel motors, or lift cylinders, it is important that the hydraulic
system is charged properly. Remove the air from the system and its components
to reduce the chance of damage.
Change the hydraulic-fluid filters when you repair or replace the
hydraulic components.
1. Park the machine on a level surface and shut off the engine.
2. After the hydraulic system components have been properly installed and if
the traction pump was rebuilt or replaced, ensure that the traction pump
housing is at least half full of clean hydraulic fluid.
3. Ensure that all of the hydraulic connections, lines, and components are
secured tightly.
Note: Flush and fill the hydraulic system and tank whenever there is a
severe component failure or the system is contaminated; refer to
the Hydraulic System (page
4. Ensure that the hydraulic tank is full. Add correct quantity of hydraulic fluid if
necessary; refer to the Operator's Manual.
5. Check the control linkage for proper adjustment, binding, or damaged parts.
6. Prime the hydraulic pumps; refer to
4–88).
Before lifting the machine with a jack, review and follow
Instructions (page 1–6).
7. Lift and support the machine with jack stands so that all the drive wheels
are off the ground.
Ensure that the machine is safely supported so that it does not move
or accidentally fall and prevent injuring anyone under the machine.
8. Ensure that the traction pedal is in the N
and run it at low-idle speed (1,175 to 1,225 rpm).
Note: The hydraulic pumps must pick up the hydraulic fluid and fill the
hydraulic system. If there is no indication of fill in 30 seconds, shut off the
engine and find the cause.
9. After the hydraulic system starts to show the signs of fill, actuate a joystick
switches until the lift cylinder rod moves in and out several times.
10. If the lift cylinder does not move after 3 to 5 seconds or if the pump emits
abnormal sounds, shut off the engine immediately, and find the cause or
problem. Inspect for the following:
A. The oil filter or suction lines that are loose.
B. An incorrect hose routing.
IMPORTANT
4–89).
Priming the Hydraulic Pumps (page
IMPORTANT
CAUTION
EUTRAL
Page 4–94
Flushing
Jacking
position. Start the engine
Groundsmaster ®
16226SL Rev C
4300-D