SAF-HOLLAND XL-TA10006OM Drum Brake Axles Tapered and Parallel Spindle Axles - Manual (Page 30)

30 XL-TA10006OM-en-US Rev B · 2014-03-13 · Amendments and Errors Reserved · © SAF-HOLLAND, Inc., SAF-HOLLAND, HOLLAND, SAF,
and logos are trademarks of SAF-HOLLAND S.A., SAF-HOLLAND GmbH, and SAF-HOLLAND, Inc.
Troubleshooting
PROBLEM POSSIBLE CAUSE RESOLUTION
Brakes will not release
Brake shoes bound up at anchor pins Lubricate brake operating parts
Brake hoses Restricted Replace hoses
Brakes out of adjustment Adjust brakes
Damaged brake assembly Replace or repair as required
No brakes or insufficient brakes
(NOTE: All of the possible causes would result
in brake lockup.)
Source of air supply shut off at tractor
Open cutout cocks at rear of tractor cab or push
control valve “IN”
Low brake line pressure Check air pressure gauge on tractor - inoperative
Brake lines between tractor and trailer not
properly coupled
Properly couple brake lines
Reservoir drain cock open Close drain cock
Dog tracking
Leaf spring broken Replace complete spring
Bent Axle Replace or straighten axle
Frame or suspension out of alignment Straighten frame or align axles
Uneven tire wear
Over or under inflation Inflate to proper pressure
Loose wheel stud nuts or clamps Tighten wheel stud nuts or clamps
Loose or tight wheel bearing adjustment Adjust bearings
Axle bent or out of alignment Straighten, align or replace axle
Tires not properly matched Match tires
Improper acting brakes Correct brakes as required
Rapid Stopping Apply brakes slowly when approaching stop
High-speed driving on turns Reduce speed
Grabbing brakes
Oil, grease or foreign material on brake lining Reline brakes
Brakes out of alignment Adjust brakes
Brake drum out-of-round Replace brake drum
Damaged brake chamber or internal assembly Replace brake chamber/internal assembly
Leaky or broken hose between relay valve and
brake chamber
Replace or Repair as required
Excessive heat cracks on drum
Rapid stopping or poor air flow to brakes Replace drum
Out of adjustment Adjust brakes
Binding S-Cam, anchor pins or chamber rod end pin Lubricate and free up
Damaged brake assembly/brake drum out-of-round Replace or repair as required
ABS inoperable Refer to ABS manufacturer’s service literature
Slow brake application or release
Lack of lubrication Lubricate brake operating parts
Excessive travel in brake chamber push rod Adjust brakes
Restiction in hose or lines Replace hoses
Defective brake valve Replace brake valve
22. Troubleshooting Chart