Speed Controls And Linkage - Tecumseh ECV100-120 - TECHNICIAN S Handbook

SPEED CONTROLS AND LINKAGE

Many different types of speed controls and linkage are used for O.E.M. applications. Linkage attachment points are
best recorded or marked prior to disassembly. This assures the correct placement during reassembly. The solid link is
always connected from the outermost hole in the governor lever to the throttle in the carburetor. The link with the
governor spring attached is connected between the control lever and the lower hole in the governor lever. Horizontal
engines use one location (non-adjustable) speed control brackets. Most vertical engines use an adjustable speed
control bracket mounted above the carburetor. The ignition ground out switch, idle R.P.M. and high speed R.P.M.
adjustment screws are located on the speed control bracket and some models use the idle R.P.M. adjustment on the
carburetor.
Vertical shaft engines must have the speed control bracket aligned when installing. To align the control bracket, use
the following steps.
1. Loosen the two screws on the top of the panel.
2. Move the control lever to full wide open throttle
position and install a wire or aligning pin through the
hole in the top of the panel, the hole in the choke
actuating lever, and the hole in the choke (diag. 12).
3. With the components aligned, tighten the two screws
on the control panel.
The following pages illustrate common linkage
attachment. Whenever the carburetor or the governor
linkage is removed or replaced, the engine R.P.M.'s
should also be checked. Use microfiche card #30 or the
computer parts look-up system for the correct R.P.M.
settings for the engine model and specification.
SNAP IN "STYLE SPEED CONTROL"
This style of speed control is used on 3 - 6.75 model
rotary mower engines and is adjusted by two bendable
tabs. Use the speed adjustment tool (part # 670326) as
illustrated in diag.13 to adjust engine speed.
To adjust high speed, move the speed control lever to
the high speed position and align the high speed pin
holes. Place the adjustment tool on the high speed tab
and move the tab to achieve the correct engine speed.
Move the speed control lever to the low speed position,
place the adjustment tool on the low speed tab and bend
to either increase or decrease to the correct speed.
LOW SPEED TAB
HIGH SPEED
PIN POSITION
Main Menu
12
HIGH SPEED TAB
DECREASE
INCREASE
TOOL 670326
13
29