SECTION 3 - CHASSIS & TURNTABLE
3121200
3-21
3.8
HYDRAULIC BRAKE COUPLER
Troubleshooting
IF ANY OF THE FOLLOWING CONDITIONS DEVELOP, TRAILER MUST NOT BE
USED UNTIL PROPER CORRECTIVE ACTION IS TAKEN.
Table 3-5. Surge Brake Troubleshooting
Symptom
Cause
Solution
Squeaking, Clatter, or Chucking
Lack of Hitch Ball Lubrication
Lubricate with conventional automotive grease or commercial lubricant
made for hitch balls
Binding Linkage & Pivots on Brake Actuator
Oil linkage & pivots on brake actuator
Loose Hitch Ball
Inspect hitch and tighten
Loose Hitch
Inspect hitch and tighten
Actuator loose on trailer frame
Inspect brake actuator and tighten
Hitch ball worn or too small
Replace
Overheated Brakes
Replace wheel bearing
Broken Brake Drum(s)
Replace brake drum(s) & check brake shoes
Low Brake fluid level
Fill & bleed brakes
Worn out shock absorber
Replace
Partial application of breakaway cable
Fully release breakaway cable
Brakes improperly adjusted
Check brakes
Broken brake return spring
Replace return spring
Seized actuator master cylinder
Replace/rebuild actuator master cylinder
Worn out brake shoes
Replace brake shoes and check brake drums
Leaky wheel cylinders
Replace/rebuild wheel cylinders and replace brake shoes. Clean drums
and other hardware.
Release handle does not close easily
Oversized ball
Check ball size
Ball not fully inserted into socket
Check for proper ball size. Check to see if tongue jack is fully retracted.
Hold release handle open when inserting ball.
Foreign material in actuator socket
Clean and lubricate
Brake Overheating, Side Pull, Brakes do not
Operate, Poor Brake Performance
Only one brake is applying
Check brake adjustment
Leaking wheel cylinder
Check and replace wheel cylinder and bleed brakes
Seized wheel cylinder piston
Check and rebuild/replace wheel cylinder and bleed system.
Foreign Material in Brake Unit
Clean thoroughly
Low hydraulic fluid level
Fill and bleed brakes
Bent shoulder bolt
Replace
Bent push rod in the shock absorber
Replace shock absorber
Damaged socket assembly
Replace actuator
Broken/Pinched brake lines
Replace
Brake actuator frame damaged
Replace actuator
Worn brake shoe(s)
Replace brake shoe(s)
Towing Vehicle Shaking Back and Forth
Worn vehicle suspension
Replace shock absorber
Hitch not secure
Tighten all bolts and nuts
Under-sized hitch ball
Replace with proper size
Summary of Contents for T500J
Page 1: ...Service and Maintenance Manual Model T500J PN 3121200 July 25 2018 Rev I AS NZS...
Page 2: ......
Page 16: ...xii 3121200 LIST OF TABLES TABLE NO TITLE PAGE NO This page left blank intentionally...
Page 36: ...SECTION 2 GENERAL 2 8 3121200 NOTES...
Page 143: ...SECTION 3 CHASSIS TURNTABLE 3121200 3 107 Figure 3 45 Battery Charger Schematic...
Page 234: ...SECTION 5 BASIC HYDRAULIC INFORMATION SCHEMATICS 5 60 3121200 NOTES...
Page 246: ...SECTION 6 JLG CONTROL SYSTEM 6 12 3121200 Figure 6 5 System Test Flow Chart Platform Tests...
Page 304: ...SECTION 7 BASIC ELECTRICAL INFORMATION SCHEMATICS 7 32 3121200 NOTES...
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