Blue Bird TC/2000, Owner'S Manual

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81
FRONT AXLE STOP AND STEERING
GEAR AUTOMATIC POPPET ADJUSTMENTS
To adjust the automatic poppets and axle stops, do the following.
1. Adjustment of axle stops and steering gear pressure relief valves (poppet valves) should be made
after toe-in has been set on the front axle.
2. With front tires on turn angle plates, center left front tire in the straight ahead position using align-
ment equipment. Set turn angle plates to zero.
3. The right-hand axle stop should be adjusted so that for a full right-hand turn, the turn angle plate
under the right-hand tire reads 42 + 0.5 degrees. The left-hand axle stop should be adjusted so that for
a full left-hand turn, the turn angle plate under
the left-hand tire reads 42 + 0.5 degrees. Lock axle
stop jam nuts after adjusting. If necessary, the pit-
man arm may be i (1) spline from origi-
nal alignment mark to obtain applicable degree of
wheel cut in both directions.
4. Remove turn angle plates. Verify that axle stops
contact axle pad at full right-hand and left-hand
turns. It may be necessary to relieve tire flex by
rolling bus forward or backward, in order to make
stops contact. There must be at least 1/8" clear-
ance between pitman arm, drag rod and front axle
tie rod and all potential interference points.
The turning radius may be increased at any time by readjusting the axle stops and rotating steering first
clockwise then counter clockwise. The steering gear poppets will adjust automatically for the increased
turning radius.
If it becomes necessary to shorten the turning radius, the steering gear poppets must be adjusted manu-
ally by doing the following. Read the section on special poppet valve manual readjustment in the TAS65
Service Manual before proceeding.
1. Set axle stops for correct turn.
2. Turn new adjusting poppet screw #1469261 into jam nut until flush with end of screw.
3. With bus unloaded and engine off and axle straight ahead, remove and discard fixed poppet screw at
bottom of steering gear. (NOTE: Timing marks on end of sector shaft and housing are to be aligned)
4. Install new adjusting poppet screw #1469261 and torque jam nut to 33-37 ft. lbs.
5. Refill power steering reservoir.
6. With engine at idle, turn steering wheel clockwise until axle stop is contacted and torque steering
wheel to rim pull of 48 ft. lbs.
7. Loosen jam nut on adjusting screw and back out screw 1" to 1 1/16" beyond the jam nut and retorque
the jam nut to 33-37 ft. lbs.
8. With engine at idle, turn steering wheel in opposite direction (counterclockwise) until axle bottoms on
axle stop and torque steering wheel to a rim pull of 30 ft. lbs.
9. Turn steering wheel clockwise to the axle stop contact position. With steering wheel being held in this
position, loosen the jam nut on the adjusting screw one turn. Hold the nut from turning and turn
adjusting screw in to a torque of 10-20 in. lbs. increase, and back out adjusting screw (4) turns, not to
exceed 1 1/16" beyond the jam nut and release the steering wheel. Retorque the jam nut to 33-37 ft.
lbs.
MAXIMUM
TURNING ANGLE
JAM NUT
STOP SCREW
KNUCKLE POSITIONS
FOR STOP SCREW
ADJUSTMENTS