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. On vertical shaft
engines 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. Some models use the idle R.P.M. adjustment on the
carburetor.
Most 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.
LOOSEN TO ADJUST
CONTROL LEVER
LOW SPEED TAB
HIGH SPEED
PIN POSITION
WIRE
HOLE
12
HIGH SPEED TAB
DECREASE
Þ
INCREASE
TOOL 670326
13
29