Ring To Pinion Gear Engagement - Toro Workman 3000 Series Service Manual

17. Make sure both plugs (12) and O–rings (13) are
installed. Verify that plugs are torqued between 20 to 25
ft–lb (2.8 to 3.5 kg–m).

Ring to Pinion Gear Engagement

When replacing the ring and pinion gear set, final posi-
tion of pinion is verified by using the gear contact pattern
method as described in the following procedure. Note:
engagement contact of original production ring and pin-
ion gear may differ slightly from gear pattern shown.
GEAR TOOTH DEFINITIONS (Fig. 62):
Toe - the portion of the tooth surface at the end to-
wards the center.
Heel - the portion of the gear tooth at the outer end.
Top Land - top surface of tooth.
1. Paint the teeth of the ring gear, both drive and coast
side, with a gear marking compound, such as DyKem�
Steel Blue.
2. While applying a light load to the ring gear, rotate the
pinion gear until the ring gear has made one complete
revolution. Both the drive side pattern and the coast side
pattern on the ring gear should be at the toe portion of
the tooth (Fig. 63).
Study the patterns in the following illustrations and cor-
rect engagement as necessary.
NOTE: When making changes, note that two variables
are involved. Example: If you have the backlash set cor-
rectly to specifications and you change the pinion posi-
tion shim, you may have to readjust backlash to the
correct specification before re–checking the pattern.
Every gear has a characteristic pattern. The illustrations
show typical patterns only and explain how patterns shift
as gear location is changed. When making pinion posi-
tion changes, shims should be changed in the range of
.002" to .004" until a correct pattern has been obtained.
Front Wheel Drive Section – 4WD (Rev. F)
DRAIN PLUG
TOP LAND
ROOT
RING GEAR
DRIVE SIDE
Heel
Page 10 – 30
FILL PLUG
Figure 61
PROFILE
TOE
LENGTHWISE
BEARING
HEEL
Figure 62
RING GEAR
COAST SIDE
Toe Toe
Figure 63
Workman 4000 Series
ARC
Heel