Specifications

INCHES 1 1/2 1 3/4 2 2 1/4 2 1/2 2 3/4 3 3 1/4 3 1/2 3 3/4 4 4 1/4 4 1/2 4 3/4 5
G-30 2 3/4° 2 1/2° 2 1/4° 2° 1 1/2° 1° 3/4° 1/2° 1/4° 0° -1/4°
P-20, 30 3° 2 1/2° 2 1/4° 2° 1 3/4° 1 1/2° 1 1/4° 1° 1/2° 1/2° 1/4° 0°
CLASS A
MOTOR
HOME
(32 – 52)
5 1/2° 5 1/4° 5° 4 3/4° 4 1/2° 4° 3 3/4° 3 1/2° 3 1/4° 3° 3°
But wait! This may not be the final version of the degree setting you will use for the CASTER.
The “frame angle” measurement will affect the caster setting.
Frame Angle
OK. Here is how the frame angle is measured:
1. Park the motor home on a level surface.
2. Place a protractor with a level gage against the bottom of a straight section of the frame rail
near the chassis midpoint. (See illustration below)
3. Determine the angle the frame rail slopes from level.
4. Use the previously-determined caster setting from the table above as the starting point.
5. Compute the actual caster setting from the frame angle and caster measurement taken as
follows:
(a) A down-in-rear frame angle must be subtracted from a positive caster specification.
(b)An up-in-rear frame angle must be added to a positive caster specification. (This is the
most common situation.)
(c) A down-in-rear frame angle must be added to a negative caster specification.
(d)An up-in-rear frame angle must be subtracted from a negative caster specification.
http://users.sisna.com/cebula/P-Chassis-AlignmentProcess.pdf 19 Version 0.7 –Sep 14, 2005