Charging The Hydraulic System - Toro Groundsmaster 3280-D Service Manual

Charging the Hydraulic System

Groundsmaster ® 3280-D/3320
05138SL Rev B
Note: When initially starting the hydraulic system with new or rebuilt components
such as hydraulic pump, hydraulic motor, 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 filter 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 hydraulic pump was rebuilt or replaced, ensure that the hydraulic 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 reservoir whenever there is a
severe component failure or the system is contaminated; refer to
the Hydraulic System (page
4. Ensure that the hydraulic reservoir (front axle) 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. Perform the following to prevent engine from starting:
A. Disconnect the electrical connector to the fuel stop solenoid on
Groundsmaster 3280-D machines.
B. Disconnect and ground all engine spark plug wires on Groundsmaster
3320 machines.
7. Prime the hydraulic pump; refer to
8. Connect the fuel stop solenoid (Groundsmaster 3280-D) or spark plug wires
(Groundsmaster 3320) to allow the engine to start.
9. Ensure that the traction pedal is in the N
is in the O position. Start the engine and run it at low-idle speed.
FF
Note: The hydrostat/hydraulic pump 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.
10. After the hydraulic system starts to show the signs of fill, press the deck lift
switch until the lift cylinder rod moves in and out several times.
11. 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 charge relief valve in the hydraulic pump that is damaged.
12. After the lift cylinder moves normally, proceed to step 13.
IMPORTANT
5–80).
Priming the Hydraulic Pump (page
EUTRAL
Page 5–85
Flushing
position and the PTO switch
Hydraulic System: Service and Repairs
5–79).