Service Bulletin

Customer Service Bulletin
Commercial Business Group
Workman
®
3000/4000 Series Date: October 25, 2006
Model/Serial Range: Model Number: Serial Numbers:
07211 & 07211TC 220000101-230099999
07212 & 07212TC 220000101-230099999
07218 & 07218TC 220000101-230099999
07360 & 07360TC 240000101-250000700
07361 & 07361TC 240000101-250000700
07365 & 07365TC 240000101-250000700
Subject: Elevated Idle and/or Engine Run-On
Two engine performance situations have been reported on some liquid cooled, gasoline
powered Workman vehicles: units that fail to completely return to low idle (1100 RPM)
after releasing the accelerator pedal, and units that continue to run on or “diesel” for a
few moments after the ignition is switched off. In a few instances, both issues have
been reported on the same vehicle. The following procedures have proven to correct
the complaints in most cases.
To correct
Elevated Idle: First, verify that the idle stop screw is adjusted to 1100 rpm
low idle; if the adjustment screw is found to not contact the stop with the accelerator
pedal not depressed, check the throttle cable and accelerator pedal pivot for any
restriction of free movement in both directions. Check for varnish deposits in the
carburetor throat that could inhibit free movement of the throttle plate, and verify that the
accelerator pedal ball joint is free moving and all governor and carburetor springs are in
place and undamaged (over-extended).
To correct
Engine Run-On: Make all of the same checks as above; also verify that the
air filter is clear of debris that could restrict airflow creating a rich fuel condition.
Remove and inspect all spark plugs for excessive carbon deposits, and check the fuel
tank fill cap to confirm it is venting properly. The cap is designed to vent excess fuel
tank air pressure due to heat expansion at a pressure of approximately 1.5 to 2 psi. (0.1
to 0.14 bar). A simple tank vent cap test would be to first firmly set the parking brake,
and then run the engine to full normal engine operating temperature with the fuel tank
cap removed.
Do not move or drive the vehicle and keep all ignition sources away from
the vehicle during this test. Try stopping and starting the engine several times; if the
run-on condition ceases, replace the fuel cap.
If your vehicle continues to exhibit either of these issues after performing the above
procedures, please contact your local Toro Commercial Products Distributor for
correction of these issues. The factory trained service staff will able to identify and
resolve these complaints.
Ref. V05-10.doc Copyright 2006, The Toro Company