Caution, Drive belt adjustment, Transport (free-wheel) valve adjustment – John Deere stx38 User Manual

Page 255

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3/21/97

6 - 23

HYDROSTATIC POWER TRAIN

TESTS AND ADJUSTMENTS

DRIVE BELT ADJUSTMENT

1. Lock park brake.

2. Carefully pull larger tensioning idler (C) rearward

until belt (A) can be removed from adjustable idler
(E), then slowly release tensioning idler.

3. Loosen and move adjustable idler (E) rearward in

slot (D) in increments of 10 mm (0.39 in.).

4. Tighten adjustable idler (E) and carefully install belt

in larger tensioning idler (C).

5. Repeat procedure until belt tension is sufficient to

overcome any slippage.

6. If adjustable idler is adjusted to rear end of slot (D)

and belt tension is not sufficient to overcome any
slippage, replace belt.

NOTE: If a new belt is required, adjustable idler (E)

should be reset at front end of slot (D).

TRANSPORT (FREE-WHEEL) VALVE
ADJUSTMENT

1. Replace lever assembly (A) components as

needed.

2. Slowly engage lever (A) into over-center position

(B).

3. Watch closely that actuating pin (E) moves inward

all-the-way and, as lever snaps into over-center
position, does not move outward at all.

4. If actuating pin (E) does move outward, loosen

mounting nuts (C).

5. Push and hold edge of mounting bracket (D) inward

until actuating pin (E) bottoms out (internally). Hold
edge of bracket (D) stationary while axle mounting
nuts (C) are tightened to specification.

Specification:

Transaxle mounting nuts

. . . . . . . . . . . . . . 20.3—47.4 N•m (180—420 lb-in.)

Test Transport Valve Operation:

1. With engine off and shift lever in any position, put

transport valve lever (A) in over-center position (B)
and push tractor forward at least 3.05 M (10 ft)—
tractor should push easily the entire distance.

2. Push tractor backward the same distance—tractor

should push easily the entire distance.

3. If tractor pushes hard, repeat adjustment procedure

above—be sure actuating pin (E) does not move
outward once over-center position (B) is achieved
and mounting nuts (C) are tightened.

4. Repeat test Steps 1 and 2.
5. If tractor still pushes hard, internal component are

not assembled properly or are damaged. Remove
transaxle and make necessary inspection and
repairs (see Repair Group later in this section).

c

CAUTION

Tensioning spring (B) is under high tension.
Wear gloves and use a firm grip when stretching
spring.

B

A

M58366

D

E

C

M58250

A

M58266

B

C

E

D

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