Overspeed Relay Adjustment; General - Hobart JET-EX 4 Operation And Maintenance Manual

OM-2049
(b) Governor running too slow.
(c) Friction in throttle linkage.
(d) Governor improperly adjusted.
(e) Friction in carburetor.
(f) Springs in carburetor or throttle mechanism opposing governor action.
(g) Governor worn internally.
(3) Governor surges at no-load
(a) Friction in throttle linkage.
(b) Governor belt slipping.
(c) Carburetor mixture too lean or too rich.
(d) Timing set too fast.
(e) Faulty ignition.
(f) Governor worn internally.
(4) Governor surges under-load
(a) Governor improperly adjusted.
(b) Friction in throttle linkage.
(c) Governor belt slipping.
(d) Carburetor mixture too lean or too rich.
(e) Timing too fast.
(f) Faulty ignition.
(g) Governor running too fast.
(h) Governor worn internally.
NOTE: The governor has been pre-lubricated at the factory and does not require further attention for the
warranty period. If after the warranty period expires, the governor shows any oil leakage, the oil level
can be checked and maintained to the "OIL LEVEL HOLE" depth.

4. Overspeed Relay Adjustment

A. General
If the overspeed relay has been replaced, the new unit may require adjustment as described below.
(1) Make certain that the speed control switch (13, Figure 1) is in IDLE position. Start the engine
and let it run at idle speed until it reaches operating temperature of 180 to 200 deg. F (82 to 93
deg. C).
(2) Manually override the control linkage at the carburetor to increase the engine speed. The over-
speed relay should shut down the engine at 3100 to 3200 RPM. If the engine shuts down below
3100 RPM or if it does not shut down at 3200 RPM, adjustment is required.
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May 20/89