Adjusting The By-Pass Valve - Toro 30187 Operator's Manual

4. Install replacement hydraulic filter onto the filter
adapter. Turn the oil filter clockwise until the rubber
gasket contacts the filter adapter, then tighten the filter
an additional 1/2 turn (Fig. 31).
5. Start engine and let run for about two minutes to purge
air from the system. Stop the engine and check for
leaks. If one or both wheels will not drive, refer
Bleeding Hydraulic System, page 27.
6. Check fluid level in hydraulic tank and add to raise
level to FULL mark on dipstick. Do Not over fill.
1
Figure 31
1. Hydraulic filter
2. Gasket
Bleeding the Hydraulic System
The traction system is self bleeding, however, it may be
necessary to bleed the system if fluid is changed or after
work is performed on the system.
1. Raise the rear of machine until wheels are off the floor
and support with jack stands.
2. Start the engine and run at idle speed. Engage traction
on one side and spin the wheel by hand.
3. When the wheel begins to spin on its own, keep it
engaged until wheel drives smoothly. (minimum
2 minute)
4. Check hydraulic fluid level as it drops and add as
required to maintain level.
5. Repeat procedure on opposite wheel.
Checking the Hydraulic Lines
After every 100 operating hours, check hydraulic lines and
hoses for leaks, loose fittings, kinked lines, loose mounting
supports, wear, weather and chemical deterioration. Make
necessary repairs before operating.
3
2
m–1256
3. Adapter
27
Warning
Hydraulic fluid escaping under pressure can
penetrate skin and cause injury.
• If hydraulic fluid is injected into the skin it must
be surgically removed within a few hours by a
doctor familiar with this type of injury.
Gangrene may result if this is not done.
• Keep 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.
• Make sure all hydraulic fluid hoses and lines are
in good condition and all hydraulic connections
and fittings are tight before applying pressure to
hydraulic system.

Adjusting the By-pass Valve

The by–pass valve is adjustable to ensure easy operation
with a variety of deck sizes. If the front of the deck lifts off
the ground when the upper control bar is quickly pushed
forward or the machine is unable to drive up hills, an
adjustment may be needed.
Testing the By–pass Valve
1. Start engine and run for 5 minutes at 3/4 throttle, to
warm hydraulic fluid.
2. Drive the machine to a clear and level open area such as
a driveway.
Important There should be at least 10 feet of clear area
in front of the machine.
3. Loosen the quick release levers and push the reference
bar forward to the fast position. Lock the quick release
levers to secure the reference bar.
4. Move throttle control to 3/4 throttle.
5. Quickly push the upper control bar against the reference
bar. The front caster wheels should almost lift off the
ground. If front caster wheels lift the off the ground, the
machine is too aggressive and adjustment is required.
6. Move the engine throttle to the fast position.
7. Quickly push the upper control bar against the reference
bar. The front caster wheels should lift approximately
1 inch off the ground. If front caster wheels lift the off
the ground more than 2 inches, the machine is too
aggressive. Adjustment is required.