Toro 31900A - Adjusting the Weight Transfer of the Attachment

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Adjusting the W eight
T ransfer of the Attachment
No Parts Required
Procedure
Perform this procedure only if you are installing
an attachment other than the standard rotary
cutting units (e.g., snowthrower , blade, or ail).
Y ou can change the hydraulic pressure used to
transfer the weight of the attachment to the traction
unit by adjusting the weight-transfer valve of the
hydraulic manifold. For best performance, adjust the
weight-transfer valve so that any bouncing motion of
the attachment is minimal over uneven terrain, but
also adjust the valve so that the attachment does not
ride heavily over at terrain or lower too quickly .
• T o improve the contour-tracking performance of
the attachment as you operate the machine over
uneven terrain, decrease the weight-transfer
(hydraulic) pressure at the hydraulic manifold.
Note: If the attachment casters or the leading
edge of the snowthrower oat above the ground,
the hydraulic pressure of the weight transfer valve
is too high.
• When you are cutting at turf, when the cutting
unit is scalping the grass, if the quality of cut is
uneven from side to side, or the leading edge of a
snowthrower is scraping too heavily , increase the
weight-transfer pressure at the hydraulic manifold.
Note: Increasing weight-transfer pressure also
transfers the weight from the attachment to the
wheels of the traction unit, thereby improving the
traction of the traction unit.
Adjust the weight-transfer pressure as follows:
1. Operate the machine for 10 minutes.
Note: This will warm the hydraulic uid.
2. Park the machine on a level surface, lower the
attachment, engage the parking brake, shut of f
the engine, and remove the key from the switch.
3. Locate the lift manifold from under the machine
( Figure 22 ).
g299920
Figure 22
4. Connect a pressure gauge to the test port
(labeled G1 ; refer to Figure 23 ).
g299924
Figure 23
1. Hydraulic manifold 3. T est port (G1)
2. W eight-transfer spool ( LC )
5. At the side of the lift manifold, remove the cap
from the test port (labeled G1 ; refer to Figure
23 ).
6. Loosen the jam nut at the end of the
weight-transfer spool (labeled LC ; refer to Figure
23 ).
7. Start the engine, set the throttle to HIGH IDLE .
8. Use a hex-socket wrench to adjust the
counterbalance valve of the weight-transfer
spool until the gauge indicates the desired
pressure; refer to the following table for
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