Replacing The Hydraulic Filters; Checking The Hydraulic Lines And Hoses; Adjusting The Counterbalance Pressure - Toro 30412 Groundsmaster 4000-D Operator's Manual

Replacing the Hydraulic Filters

Service Interval: After the first 200 hours
Every 800 hours
Change the 2 hydraulic filters initially after the first 200
operating hours. Thereafter, change the filters after
every 800 operating hours, in normal conditions.
Use Toro replacement filters (Part No. 94-2621 for the
left side of the machine and 75-1310 for the right side
of the machine).
Important: Use of any other filter may void the
warranty on some components.
1. Position the machine on a level surface, lower the
cutting units, stop the engine, engage the parking
brakes, and remove the ignition key.
2. Clean the area around the filter mounting area. Place
a drain pan under the filter and remove the filter
(Figure 70).
3. Lubricate the new filter gasket and fill the filter with
hydraulic fluid.
4. Ensure that the filter mounting area is clean. Screw
the filter on until the gasket contacts the mounting
plate; then tighten the filter an additional 1/2 turn.
5. Once the reservoir is filled, start the engine and let
it run at low idle for approximately two minutes.
Activate steering and raise/lower cutting units
several times to purge air from the system. Stop the
engine and check for leaks.
Checking the Hydraulic Lines
and Hoses
Service Interval: Every 2 years
Inspect the hydraulic lines and hoses daily for
leaks, kinked lines, loose mounting supports, wear,
Figure 70
loose fittings, weather deterioration, and chemical
deterioration. Make all necessary repairs before
operating.
Hydraulic fluid escaping under pressure can
penetrate skin and cause injury.
• Make sure all hydraulic fluid hoses and
lines are in good condition and all hydraulic
connections and fittings are tight before
applying pressure to the hydraulic system.
• Keep your body and hands away from pin
hole leaks or nozzles that eject high pressure
hydraulic fluid.
• Use cardboard or paper to find hydraulic
leaks.
• Safely relieve all pressure in the hydraulic
system before performing any work on the
hydraulic system.
• Seek immediate medical attention if fluid
is injected into skin.
Adjusting the Counterbalance
Pressure
The counterbalance test port (Figure 71) is used
to test the pressure in the counterbalance circuit.
Recommended counterbalance pressure is 470 psi (3241
kPa). To adjust the counterbalance pressure, rotate the
adjusting screw (Figure 71) clockwise to increase the
pressure or counterclockwise to decrease the pressure.
Note: All three side cutting units castor wheels should
remain on the ground with counterbalance applied.
1. Counterbalance test port
49
Figure 71
2. Counterbalance adjusting
screw