Charging The Hydraulic System - Toro Groundmaster Series Service Manual

Charging the Hydraulic System

Hydraulic System: Service and Repairs
Air must be purged from the hydraulic system to reduce the chance
of component damage.
When initially starting the hydraulic system with new or rebuilt components such
as wheel motors, pumps, or cylinders, it is important that the hydraulic system
is charged properly to remove air from the system.
Flush the hydraulic system whenever there is a severe component
failure or the system is contaminated; refer to
System (page 5–55).
1. Park the machine on a level surface and set the key switch to the O
position.
2. Ensure that all of the hydraulic connections are secured tightly.
3. Ensure that the hydraulic tank is full. Add the correct quantity and type of
hydraulic fluid if necessary; refer to the traction unit Operator's Manual.
4. If the traction (piston) or gear pump was replaced or repaired, prime the
hydraulic pumps; refer to
Review and follow the
the machine.
5. Raise the front wheels of 2WD machines, or all of the wheels for 4WD
machines off the floor and support the machine with jack stands.
6. Make sure the traction pedal is in neutral., then start the engine and let it idle
at low speed. The hydraulic pumps should pick up hydraulic fluid and fill
the hydraulic system. If there is no indication of the system filling within 30
seconds, stop the engine and determine the cause.
Check hydraulic tank fluid level frequently while charging the system
and add fluid if necessary.
7. After the hydraulic system starts to show the signs of fill, operate the deck lift
switch until the lift cylinders move in and out several times.
8. If the cylinders do not move after 15 seconds or the pump emits abnormal
sounds:
A. Immediately set the key switch to the O
B. Make sure the hydraulic fluid filter or the suction line is not loose.
C. Check for incorrect hose routing.
D. Ensure that the suction line is not blocked.
E. Make sure the charge relief valve (R3) is not damaged or blocked open.
IMPORTANT
IMPORTANT
Priming the Hydraulic Pumps (page
WARNING
Jacking Instructions (page 1–6)
IMPORTANT
Page 5–62
Flushing the Hydraulic
5–60).
before lifting
f position.
F
Groundsmaster ® 3200, 3300 and 3310
19240SL Rev A
FF