FAILSAFE BRAKE GENERAL INFORMATION
Mounting flange dimensions per SAE J744, unless otherwise specified.
Maximum recommended working pressure is 3000 psi, unless otherwise specified.
All torque values given are for DRY brakes with the exception of the Failsafe Brake with One-Way Clutch
and wet operation Failsafe Brakes where noted.
Torque values are static load rated at zero psi back pressure.
Hydrostatic bench testing with pressures in excess of 2000 psi may cause component warpage or bolt
failure. Mounting bolts must be used for supplemental clamping. Tighten bolts to torque shown below.
Surge pressure in excess of 3000 psi caused by pump surge or rapid opening or closing of control valve is
detrimental to brake life and must be avoided.
Gaskets for the hydraulic motor and gear reducer ends are recommended and accompany each brake.
Use only SAE grade 5 mounting bolts adequately torqued:
.38-16 UNC 2A,
31-38 LB FT
1.00-8 UNC 2A,
540-650 LB FT
.44-14 UNC 2A,
50-60 LB FT
M12 x 1.75-6g,
65-75 LB FT
.50-13 UNC 2A,
75-85 LB FT
M16 x 2-6g,
165-200 LB FT
.62-11 UNC 2A,
135-165 LB FT
M20 x 2.5-6g9,
240-285 LB FT
.75-10 UNC 2A,
240-285 LB FT
Heavy duty is designated for certain SAE 'B' and 'C' Failsafe Brake models where high torque, continuous use
and rpm's in excess of 1500 are required. These contain heavy duty rotating discs which are designed for lower
unit spline compression loading by using a combination of increased thickness, and/or larger rotating disc splines
and tougher core material.
Side loads on brake bearings are unacceptable. Use overhung load adapters.
Hydraulic fluids other than petroleum base can be used. The two system brakes, Failsafe Brake with Back
Pressure Compensation and Failsafe Brake with Service Brake, can use separate fluid types. In every instance,
seal material must be compatible with the specific hydraulic fluid.
When emergency release of the Ausco Failsafe Brake is required, an Ausco Hydraulic Hand Pump #31090 (pg.
38) can be incorporated into the hydraulic system.
In the unlikely event of fluid leakage into the brake, all SAE 'B' and 'C' Failsafe Brakes, Failsafe Brakes with
Service Brake and Failsafe Brakes with Back Pressure Compensation, are designed to prevent pressure buildup
inside the brake housing.
Refer to Ausco Application Ideas booklet #F32840 for a general representation of-Failsafe Brake applications.