Service Information Bulletin (No. 96-008) - Sabre 1338 Gear Technical Manual

SERVICE INFORMATION BULLETINS
Service Information Bulletin
October 15, 1996
SUBJECT:
AFFECTS:
Complaint or Symptom:
1) Mower drive belt smokes when PTO (blade drive) lever is dis-engaged.
2) May be accompanied by a "squealing" noise at higher engine speeds.
Situation: Several items can contribute to this problem:
- Deck idler arm tension rod not adjusted properly (set too tight)
- Spindle brake pad clearance too wide
- Bent or deformed engine sheave belt guide or bracket (46-inch deck only)
- Belt keepers or guides not oriented properly
- Belt not routed properly
- Deck improperly leveled
Solution:
- Check tension rod setting per Fig. 1 & 2. Readjust to correct preset dimensions.
- Check and adjust all spindle brake clearances. Clearance should be 2-3mm (0.078"-
- Check for bent or deformed engine sheave belt guide and/or bracket (46-inch only). See Fig. 3.
- Check and readjust belt guides on mower deck. See Fig. 4 & 5.
- Ensure deck belt is routed properly around all pulleys, sheaves and guides. See Figure 4 & 5.
- Check deck leveling. Deck should be level side-to-side (within 1/4") and be 1/8"-3/8" lower in the
Additional Information:
- Anytime the tension rod is adjusted, it is important that the spindle brake clearances be
- Incorrect spindle brake pad adjustments can result in the brake pad pulling away too far from the
- A bent or deformed engine sheave belt guide or ground drive keeper can prevent the belt from
- Mower deck leveling should be checked anytime belt problems occur. All measurements should
S
Peery Gibson
Product Service Manager
10 - 6
www.servicemanualall.com
MOWER DRIVE BELT SMOKING WHEN PTO (BLADE DRIVE) LEVER IS
DISENGAGED - MAY BE ACCOMPANIED BY A "SQUELING" NOISE
(ADDENDUM TO SIB 96-004, MAY 14, 1996)
SABRE Lawn Tractors
0.118") with the PTO (blade drive) lever in the engaged position.
front than in the rear. NOTE: Deck leveling measurements should be made at blade tips,
not from the surface of the deck shell. Use John Deere Deck Leveling Gauge P/N
TY15272 as an aid in leveling deck.
checked to ensure proper clearances in the engaged position and proper contact of the
pad to the spindle in the disengaged position.
spindle, not allowing the idler arm to return completely to the "at rest" position when the
PTO (blade drive) lever is pulled back. The mower drive belt continues to rotate and not
release fully from the engine sheave even though the PTO lever has been disengaged.
"blossoming" off the sheave and releasing fully when the PTO lever is disengaged. Fig.3
shows the correct clearances for the 46-inch deck. If the clearances cannot be obtained
without deforming the welded ground drive keeper bracket, remove the belt guide and re-
install it on the front side of the bracket. This should achieve the specified clearances to
ensure the mower drive belt "blossoms" properly off of the engine sheave.
be made from blade tips. There should be no more than 1/4" difference in the side-to-
side measurements. Use J-bolt on left side of deck to make side-to-side adjustments.
The front of the deck should be 1/8"-3/8" lower than the rear of the deck. Adjust front
draft rods equally to make front-to-rear (rake) adjustments.
No. 96-008
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