John-deere stx38 User Manual download pdf (Page 198)

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3/21/97

TESTS AND ADJUSTMENTS

POWER TRAIN

TESTS AND ADJUSTMENTS

CLUTCH/BRAKE PEDAL LINKAGE

AND TRACTION DRIVE SYSTEM

Reason:

To ensure clutch/brake pedal linkage and traction drive

system maintains traction in all three lower gears up a

17° slope. Also, to ensure it disengages traction drive

belt, engages brake to slow down or stop tractor within

a specified distance, and holds tractor stationary in

PARK position on a 17° slope or less.

Procedure:

NOTE: This is a four part test and adjustment

procedure:

• Test drive on 17° slope,

• Brake spring adjustment,

• Clutch spring adjustment,

• Repeat test drive on 17° slope.

Test Drive—

1. Test drive tractor to see if traction drive system

pulls tractor up a 17° slope in all three lower gears.

2. Look for a steady pull in all three lower gears up the

slope.

3. If traction test fails in any or all of the three lower

gears, the belt tension must be adjusted.

4. Drive or push tractor onto a 17° slope and lock

clutch/brake pedal in PARK position.

5. Park brake must hold tractor stationary on

slope and tractor must not creep downward

once park brake is set.

6. Drive tractor on dry pavement in a safe, open, and

level area at fast idle in high gear. Apply a “panic

stop” force (no more than 50 pounds of force) to

brake pedal—

tractor must stop within 0.9—1.5

M (3—5 ft) and both wheels should lock-up,

leaving skid marks on pavement

7. Repeat Steps 4—6 for reverse.

8. If any test fails, the clutch and brake linkages must

be adjusted or components replaced.

IMPORTANT: Anytime the brake or clutch spring

need to be adjusted, both must be examined to

ensure desired results will be obtained.

BRAKE SPRING ADJUSTMENT

IMPORTANT: Anytime the brake or clutch spring

needs to be adjusted, both must be examined to

ensure desired results will be obtained.

1. First check for brake disc contacting the case (1)

and/or brake lever contacting its mounting bracket

(2), top or bottom. Clearance between friction

pucks and disc should be 0.254—0.508 mm

(0.010—0.020 in.). If necessary, replace friction

pucks and disc before making any adjustments.

CAUTION

DO NOT engage clutch/brake pedal too

aggressively or tractor may tip over backwards

while performing the test drive on a 17° slope.

M42597

M42598

M58279

Contact Points

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John-deere stx38 User Manual Page 198

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