Charge Hydraulic System - Toro Groundsmaster 4500-D Series Service Manual

Charge Hydraulic System

Groundsmaster ® 4500-D/4700-D
19245SL Rev A
Note: When initially starting the hydraulic system with new or rebuilt components
such as motors, pumps or lift cylinders, it is important that the hydraulic system
be charged properly. Air must be purged from the system to reduce the chance
of component damage.
Change hydraulic oil filters whenever hydraulic components are
repaired or replaced.
1. Park machine on a level surface. Lower cutting decks, stop engine and apply
parking brake. Remove key from the ignition switch.
2. Make sure all hydraulic connections, lines and components are secured
tightly.
3. If hydraulic component failure was severe or the hydraulic system is
contaminated, flush and refill hydraulic system and hydraulic reservoir (see
Flush Hydraulic System (page
When filling hydraulic reservoir, use only hydraulic fluids specified
in Operator's Manual. Other fluids could cause system damage.
4. Make sure hydraulic reservoir is full. Add correct hydraulic oil to reservoir
if necessary.
5. Prime hydraulic pumps (see
Before jacking up the machine, review and follow
Instructions (page 1–7).
6. Raise machine so that all wheels are off the ground and place appropriate
jack stands under the frame to support the machine.
During initial operation, check hydraulic reservoir oil level frequently
and add oil as necessary.
7. Make sure traction pedal and lift switches are in neutral. Start engine and
run at low idle speed. The gear pump should pick up oil and fill the hydraulic
system. If there is no indication of fill in thirty (30) seconds, stop the engine
and determine the cause.
8. After the hydraulic system starts to show signs of fill, actuate a lift switch until
the lift cylinder rod moves in and out several times. If the lift cylinder does not
move after ten (10) to fifteen (15) seconds, or if the pump emits abnormal
sounds, shut the engine off immediately and determine cause or problem.
Inspect for the following:
A. Loose filter or suction lines.
B. Blocked suction line.
IMPORTANT
5–91)).
IMPORTANT
Priming Hydraulic Pumps (page
WARNING
IMPORTANT
Page 5–95
5–90)).
Jacking
Hydraulic System: Service and Repairs