Control Valve Test
- Disconnect overtravel lever from link. Exhaust air from shocks by holding lever down until air sleeves deflate. Start engine and run at idle. Pressurize system with external source, using tire-type valve, to 90-100 psi.
- Hold lever down, in exhaust position, until air sleeves deflate. If sleeves do not deflate, remove exhaust adaptor from control valve and hold lever down to deflate sleeves. If sleeves now deflate, replace adaptor, "O" ring, and filter. If defective condition is not corrected by the above, replace control valve.
- Hold lever up, in intake position, until sleeves inflate. If sleeves inflate and hold, proceed to Time Delay Check. If sleeves inflate, then leak down, check lines, fittings, and sleeves for air leaks. If sleeves still do not inflate, perform Height Control Valve Test, as described.