Charging The Hydraulic System - Toro ProLine H800 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 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 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. Disconnect the electrical connector to the fuel stop solenoid to prevent
engine from starting.
7. Prime the hydraulic pump; refer to
8. Connect the electrical connector to the fuel stop solenoid to allow the engine
to start.
9. Ensure that the traction pedal is in
the OFF position. Start the engine and run it at low-idle speed.
Note: The 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 cylinders 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.
13. Turn the steering wheel in both directions so that the steering cylinders move
in and out several times.
14. Operate the traction pedal in the forward and reverse directions. The drive
wheels should rotate in the proper direction. If the wheels rotate in the wrong
direction, shut off the engine, inspect the hydraulic line placement at the
hydraulic pump and hydraulic motor. Correct the hydraulic line installation
before you proceed.
IMPORTANT
5–66).
Priming the Hydraulic Pump (page
NEUTRAL
Page 5–72
Flushing
position and the PTO switch is in
ProLine H800
19241SL Rev A
5–70).