TM 5-3805-260-24
DIFFERENTIAL LOCK PEDAL ADJUSTMENT
PEDAL ADJUSTMENT
1. Differential lock pedal. A. Distance .75 In. (19.00
mm). B. Valve stem movement .16 F .03 In. (4.1 i 0.8
mm).
1.
Adjust the bolt on the bottom of pedal (I) so there
is a distance (A) of approximately .75 in. (19.0
mm) between the bottom of the bolt head and the
bottom of the shoulder on the pedals.
2.
With the pedal pushed down, adjust the bolt to
permit a valve stem movement (B) of. 16 + .03 in.
(4.1 + 0.8 mm).
BRAKE CONTROL VALVE (LEAKAGE CHECK)
Start the engine and let the air pressure go up.
Push down on the brake pedal and hold it down. Put
soap suds on the air line connections at the air chambers
and check for air leakage. Release the brake pedal. Put
soap suds on the exhaust passage of the brake control
valve. Leakage must not be more than 1.00 in. (25.4
mm) soap bubble in one minute. Correct any air leaks.
BRAKE ADJUSTMENT
Caliper disc hydraulic brakes need no adjustment.
There is no return mechanism to force the pads away
from the discs. The pads are in slight contact all the time
with the discs to keep them clean.
AIR IN THE HYDRAULIC BRAKE SYSTEM
TRACTOR AIR CHAMBER AND MASTER CYLINDER
1. Air line. 2. Master cylinder. 3. Valve. 4. Oil line to
tractor brakes. 5. Air chamber. 6. Stroke indicator.
SCRAPER AIR CHAMBER AND MASTER CYLINDER
7. Master cylinder. 8. Air chamber. 9. Air line. 10. Oil
line to scraper brakes. A1. Valve. 12. Stroke
Indicator. 13. Quick release valve.
Air in the hydraulic brake system cannot be detected
by brake pedal "feel." However, a stroke indicator on
each master cylinder will provide a means of detecting a
"soft" pedal condition which will cause increased master
cylinder piston movement. If the movement of stroke
indicators (6) and (12) is too much, check for hydraulic
leaks or air in the system.
NOTE: If the leak results from a damaged cup or seal,
the hydraulic brake system may be contaminated. Drain
the brake fluid and flush the system with denatured
alcohol. the system is free of leaks, check for air. Bleed
each hydraulic brakes .system. See the topic, AIR
REMOVAL FROM BRAKES (Bleeding the Brakes).
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