Checking the Suspension Height
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Do not overtighten the bolts in the Barksdale height-control valve housing. The bolts should not be loose, and should not require tightening. Only if necessary, tighten the valve housing bolts 45 lbf·in (500 N·cm). Any damage to the valve housing will void the warranty.
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Do not attempt to disassemble the Barksdale valve body or the control lever. There are no serviceable parts in the valve, and any disassembly will void the warranty.
- Park the vehicle on a level surface, using a light application of the brakes. Do not apply the parking brakes. Shift the transmission into neutral, and build the secondary air pressure to at least 100 psi (690 kPa). Shut down the engine. Have an assistant chock the tires on one axle only.
- Mark the location of the front and rear tires on the floor.
- Measure the distance between the left forwardmost axle
stop and the suspension as indicated. See Table , Table , Table , Table and Table for an acceptable range of heights for each suspension.
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Valve Mounting Bracket
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Height-Control Valve
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Stud Bolt
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Linkage Rod
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Axle
Fig. 1, Barksdale Height-Control Valve Installation (side view) (typical)
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- If the measurement is not within the acceptable range,
refer to the Cascadia™ Workshop Manual for adjustment
instructions. If the distance is within the acceptable range, apply
the parking brakes.
Table 1, Suspension Ride-Height Measurement, Dual-Leaf Spring, 21k/40k High Ride
Measure Point
Suspension Height Measurement
Min.
Target
Max.
A = Measure Here
2-3/8 inch (60 mm)
2-5/8 inch (67 mm)
2-7/8 inch (73 mm)
Table 1, Suspension Ride-Height Measurement, Dual-Leaf Spring, 21k/40k High Ride
Table 2, Suspension Ride-Height Measurement, Single-Leaf Spring, 21k/40k, High Ride
Measure Point
Suspension Height Measurement
Min.
Target
Max.
A = Measure Here
2-3/8 inch (60 mm)
2-5/8 inch (67 mm)
2-7/8 inch (73 mm)
Table 2, Suspension Ride-Height Measurement, Single-Leaf Spring, 21k/40k, High Ride
Table 3, Suspension Ride-Height Measurement, Single-Leaf Spring, 40k Low and Mid Ride
Measure Point
Suspension Height Measurement
Min.
Target
Max.
A = Measure Here
2-3/8 inch (60 mm)
2-1/2 inch (64 mm)
2-7/8 inch (73 mm)
Table 3, Suspension Ride-Height Measurement, Single-Leaf Spring, 40k Low and Mid Ride
Table 4, Suspension Ride-Height Measurement, Dual-Leaf Spring, 23k High Ride
Measure Point
Suspension Height Measurement
Min.
Target
Max.
A = Measure Here
2-3/4 inch (70 mm)
3 inch (76 mm)
3-1/4 inch (83 mm)
Table 4, Suspension Ride-Height Measurement, Dual-Leaf Spring, 23k High Ride
Table 5, Suspension Ride-Height Measurement, Dual-Leaf Spring, 46k High Ride
Measure Point
Suspension Height Measurement
Min.
Target
Max.
A = Measure Here
2-3/4 inch (70 mm)
3 inch (76 mm)
3-1/4 inch (83 mm)
Table 5, Suspension Ride-Height Measurement, Dual-Leaf Spring, 46k High Ride
Important: To prevent voiding the warranty on Barksdale height-control valves, note the following:
Important: Suspensions with Dual-Leaf Springs: Measure between the top of the U-bolt and the bottom of the axle stop.
Suspensions with Single-Leaf Springs: Measure between the top of the U-bolt pad and the bottom of the axle stop.