DOB 1300-1556| X3-45 Commuter PA-1648 Maintenance Manual Section 23 revised Nov 2021
8.2 POSITIONING REQUIREMENTS
To adjust the snow chain wheel as shown in
FIGURE 39, follow these steps :
1. Use a paint marker to mark vertically the
centerline of the drive axle curb side tire at
the 6 O’clock position.
2. Draw a horizontal line that intersect the
centerline mark 3 inches from the bottom of
the tire.
3. Draw another horizontal line 5 inches from
the bottom of the tire.
4. Manually extend the chain unit (arm & wheel)
so that the chain wheel contacts the sidewall
of the vehicle tire.
5. Create a rub mark on the tire by twisting the
chain wheel back and forth.
• The middle of the rub mark must match
the vertical centerline or be up to 3/8
th
of
an inch behind (rearward) the centerline.
Rub mark must never be forward the
centerline (toward front of vehicle). To
adjust centerline position, loosen the
four (4) support plate to frame bracket
screws and slide the entire mechanism
fore or aft as shown in FIGURE 37.
• The chain wheel should be level from
the front to the back of the vehicle but
can be pinched downward up to 2
degrees maximum toward the rear (use
angle gage).
• Chain wheel operating angle should be
between 5 to 10 degrees (use angle
gage) and the chain wheel must contact
the tire between the two horizontal lines
marked in steps 2 and 3 above. To
adjust the wheel angle, slightly loosen
the two (2) ball stud clamp screws and
move the wheel to the desired position
(FIGURE 38).
FIGURE 37: FORE AND AFT ADJUSTMENT VS TIRE
CENTERLINE
FIGURE 38: WHEEL ANGLE ADJUSTMENT
• Once the above requirements are met,
torque the fasteners.
Ball stud to arm (clamp) bolts.
TORQUE: 55 lb-ft (75 Nm)
Support plate to frame bracket (all)
TORQUE: 198 lb-ft (268 Nm)
6. Repeat the procedure for the street side
chain wheel.
NOTE
“SNOWCHAIN/RIGHT” for the curb side
unit and the “SNOWCHAIN/LEFT” for the
street side one.
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