John Deere stx38 - Manual (Page 258)

6 - 26
3/21/97
TESTS AND ADJUSTMENTS HYDROSTATIC POWER TRAIN
Specifications:
Brake Components Wear Tolerances—
(K) brake puck (minimum) . . . . . . . . 8 mm (0.3 in.)
(L) brake lever (minimum) . . . . . . . 25 mm (1.0 in.)
(M) brake disc (minimum) . . . . . 2.5 mm (.098 in.)
IMPORTANT: See page 6-46 Brake Pad Adjustment
to insure brake gap is set properly.
9. Replace components as necessary.
10. Install rear wheels, and lower tractor to surface.
REPEAT TEST DRIVE
1. Attach mower deck to tractor—this will help stabilize
the tractor.
2. Carefully test drive tractor to see if traction drive
system pulls tractor steadily up a 17° slope in
lower 1/3 of forward range.
3. Look for a steady pull in all three lower gears up the
slope. If tractor fails traction test, inspect traction
drive belt:
• if belt is excessively worn, stretched, glazed, or
unraveling—replace it (see Inspect, Remove, and
Install Traction Drive Belt in the Repair Section),
• if belt is not excessively worn, make finite
adjustments above or below specification to gain
proper response in traction drive system.
Remember: to lengthen clutch spring causes
increased traction and aggressiveness; to shorten
clutch spring causes decreased traction and
aggressiveness.
4. Drive tractor onto a 17° slope and lock clutch/brake
pedal in park position. Check that park brake holds
tractor stationary on slope and that tractor does
not creep downward once park brake is set.
5. If tractor fails park brake test, inspect brake
assembly components and replace as necessary.
6. Return to work area and finish installing mower.
Results:
• Test drive tractor to ensure full forward and reverse
speeds are obtained and that transaxle does not
creep in neutral position.
• If adjustments are not satisfactory, repeat
procedure until proper results are obtained.
• If adjustments are still not satisfactory, internal
transaxle repair is needed.
c
CAUTION
DO NOT engage clutch/brake pedal too
aggressively or tractor may tip over backwards.
It is recommended that you hang the mower
deck from the tractor before performing the test
drive on a 17° slope.
K
L
M
M58274
M42597
M42598