37R116 Axle Service Manual
HYDRALOC DIFFERENTIAL TEST INSTRUCTIONS
1. Air pressure test Apply 83 kpa [12 psi] to pressure and tank ports simultaneously and allow stabilization period of 20 seconds minimum. Lock off pressure and measure decay in 10 seconds. Maximum allowable decay is 23 pa [.0033 psi] in 10 seconds. Alternate decay / period is .69 kpa [.1psi] per 5 minutes. 2. Hydraulic pressure test Apply 4137 kpa [600 psi] to pressure port, with open tank line back to tank. Allow stabilization period of 20 seconds minimum and release. Reapply 4137 kpa [600 psi] and monitor fluid for a (1) one minute period. Fluid flow rate should not exceed 2.83 lpm [.75 gpm] 3. Functional test Restrict movement of one side gear in differential so it will not rotate. Determine that differential is not locked by rotating input. Apply 10342 kpa [150 psi] to Hydraloc activation port. Differential should remain locked when a pinion input torque of 427 Nm [315 LBF/FT] is applied.
18
