Ariens 915135, 915104, 915103, 915319, 915320 User Manual
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Date: December 22, 2009 No. B-2061
Service Bulletin
Ariens Company
655 W. Ryan St.
Brillion, WI 54110
www.ariens.com
Product Family: 915 Series Riding Mowers with EZT Transaxles
Subject: 51520800 Hydro-Gear Axle Nut Replacement
Dealer Action: Replace Nuts When Setting Up or Servicing the Unit
Model Serial Number
Range
915100 001138 – 001390 915130 000101 – 010212
915102 000929 – 001568 915131 000101 – 010015
915103 000583 – 000590 915132 000101 – 001026
915104 000631 – 000793 915133 000102 – 000352
915106 001244 – 001464 915135 000101 – 000421
915107 000898 – 000911 915319 000170 – 000233
915108 000594 – 000805 915320 000176 – 000285
Hydro-Gear has notified Ariens Company that it has found increased incidents of stripped hub splines on
EZT transaxles used on the above-listed consumer riding products built during the 2009 model year. To
reduce the likelihood of stripping the hub splines, Hydro-Gear recommends replacing the axle nut
p/n 08621100 (HG p/n 50863) with a new style pin lock nut p/n 21544033 (HG p/n 53711) according to the
instructions provided on page 2.
Ariens has created EZT Transaxle Nut Replacement Kit p/n 51520800 to supply the new pin lock nut to
dealers. Each kit contains two nuts, enough to service one riding mower.
Model Serial Number
Range
For any of the above-listed models in inventory, or when servicing one of the above-listed models, inspect
the transaxles for the old style axle nut. If the nuts need to be replaced, order and install EZT Transaxle
Nut Replacement Kit p/n 51520800. The instructions on page 2 provide the inspection procedure.
Installation of the kits is covered under warranty while the unit is within its standard warranty period. Dealers will be reimbursed for 0.25 hours of labor at their standard posted shop labor rate for each kit they
install.
Page 1 of 3
Date: December 22, 2009 No. B-2061
08621100 (HG p/n 50863)
Remove and replace this
nut.
21544033 (HG p/n 5371 1)
Install this style pin lock
nut.
Inspect this nut.
Inspection
Inspect the transaxles for the following Hydro-Gear model numbers ZC-*C**-****-**** or ZC-*H**-****-**** in
Hydro-Gear serial number range 8306B***** through 9256B*****.
Transaxles in these model and serial number ranges that do not have the pin lock nuts installed will need
to have the axle nuts replaced. Dealers should order and install EZT Transaxle Nut Replacement Kit p/n
51520800. If the transaxles are outside these model and serial number ranges, no replacement is needed.
Page 2 of 3
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