Charging The Hydraulic System - Toro Groundsmaster 7210 Service Manual

Charging the Hydraulic System

Groundsmaster 7210
16222SL Rev C
Note: When initially starting the hydraulic system with new or rebuilt components
such as wheel motors, gear pump, or lift cylinder, 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 filter when you repair or replace the
hydraulic components.
1. Park the machine on a level surface and shut off the engine.
2. Ensure that all of the hydraulic connections, lines, and components are
secured tightly.
Note: Flush and fill the hydraulic system and reservoir whenever there is a
severe component failure or the system is contaminated; refer to
the Hydraulic System (page
3. Ensure that the hydraulic reservoir is full. Add correct quantity of hydraulic
fluid if necessary; refer to the Traction Unit Operator's Manual.
4. Check the traction control components for proper adjustment, binding, or
damaged parts.
5. Prime the hydraulic pumps; refer to
4–58).
Before lifting the machine with a jack, review and follow
Instructions (page 1–6).
6. Raise the 2 drive wheels off the ground and place the jack stands under
the frame to support the machine.
Ensure that the machine is safely supported so that it does not move
or accidentally fall and prevent injuring anyone under the machine.
7. Start the engine and run it at low-idle speed (1,400 rpm).
Note: The charge and gear 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.
8. After the hydraulic system starts to show the signs of fill, actuate a lift switch
until the lift cylinder rod moves in and out several times.
9. 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.
C. The suction line that is blocked.
D. The implement relief valve that is damaged.
IMPORTANT
4–59).
Priming the Hydraulic Pumps (page
IMPORTANT
CAUTION
Page 4–61
Flushing
Jacking
Hydraulic System: Service and Repairs