Service Bulletin

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Customer Bulletin
Commercial Products
Vehicles #08-16
Hydraulic Noise in Steer Circuit
Product: HD/HDX Series Workman January 16, 2013
Affected Units: Models:
07366
07367
07367(TC)
07368
07368(TC)
07370
07370(TC)
07371
07371(TC)
Serial Numbers:
290000101-312001045
290000101-312001373
290000101-312001018
290000101-312000288
290000101-312000274
290000101-312001071
290000101-312001016
290000101-312000207
290000101-312000261
Situation: Objectionable hydraulic noise in the steer circuit.
HD/HDX Series Workman vehicles have been reported to possess varying levels of hydraulic steer
circuit noise. Root cause of this noise has been found to be flow pulsations from the pump resonating
through the hard lines which would excite the floor plate of the operator area of the vehicle. The
complaint is more likely to be observed in units with cabs due the enclosure trapping the sound from
the floor plate.
Replace Hose ASM (99-0965) and Fitting-HYD, 90 Degree (340-18) with Hose-ASM (121-6283) and
straight fitting Adapter (340-3). This hose has expansion characteristics that allow it to absorb the
hydraulic gear pump pulsations. A secondary hydraulic “swish” sound may be emanating from the
Pump-Steering (120-4813) when the steering wheel is turned. If this sound is found to be
objectionable, this component can also be replaced. Both of these modifications are considered
“upgrades” and are installed at customer expense.
Instructions:
Please contact your local Toro Commercial Products Distributor Service Group for more information on
this issue and assistance in correcting this complaint. Reference Commercial Service Bulletin Vehicles
#08-16, “Hydraulic Noise In Steer Circuit”, dated 2/16/2013.