Hobart Welding Products CONTRACTOR 40D OM-474 - Manuel (Page 32)

OM-474 Page 28
7-5. Adjusting Engine Speed
Ref. ST-154 952-C / ST-091 065-A
Engine speeds have been factory
set and should not require
adjustment.
Start engine and check engine
speeds with a tachometer. See
table for proper no load speeds. If
necessary, adjust speeds as
follows:
Weld/Power Speed Adjustment
Place engine control switch in Run
position.
1 Lock Nut
2 High Speed Adjustment
Screw
Loosen nut and turn screw until en-
gine runs at weld/power speed.
Tighten nut.
Y Stop engine.
3 Throttle Arm
4 Solenoid
5 Solenoid Plunger
Push arm towards solenoid so
plunger is fully bottomed in
solenoid.
6 Lock Nut
7 Low Speed Adjustment Screw
Loosen nut and back out screw if
screw hits stop before plunger is
fully bottomed. Tighten nut and
release arm.
Idle Speed Adjustment
Start engine. Place engine control
switch in Run/Idle position.
8 Lock Nut
Loosen nut and turn throttle arm un-
til engine runs at idle speed. Tighten
lock nut.
Be sure solenoid plunger is fully
bottomed in solenoid at idle speed
to avoid damaging solenoid.
Y Stop engine.
Close door.
Tools Needed:
5/16, 7/16 in
1
2
3 4 5
6
7
8
Engine Speed
(No Load)
RPM
Weld/Power
Idle
1850
1250