Engine Specifications; Electric Governor System Adjustment; Actuator Linkage Adjustment - Hobart 90CU24 Operation And Maintenance Manual

OM-2084 / Operation and Maintenance Manual
90CU24 / Series 500392 Generator Sets
Manufacturer
Type engine
Model
Engine governed speed
Idle speed
Speed limiting governor
Firing order
Fuel pump speed limiting governor
Lubricating oil pressure at 2400 RPM
Engine coolant temperature
e. Electric Governor System Adjustment
Two of the electric governor system main components, namely the magnetic pickup and electric
control box, have critical adjustments which can affect engine performance and, therefore,
generator output. Actuator-to-fuel control lever adjustment can also affect engine performance.
NOTE: When servicing the actuator linkage DO NOT lubricate the ball joints, as they are self
lubricating. DO NOT lubricate them as damage will occur.
When the complete system is to be checked, and/or adjusted, a definite sequence of procedures
should be followed:
First - Check or adjust actuator linkage
Second - Check or adjust magnetic pickup
Third - Check or adjust electronic control box.
NOTE: When making governor system adjustments, an important factor in such adjustments is the type
of fuel used in the generator set. For the engine of this generator set, carefully follow the engine
fuel guidelines referenced in 2-2, 4, (a).
(1) Actuator linkage adjustment (See Fig. 3)
The proper adjustment of the mechanical linkage between the electric actuator and engine
speed control lever is important to the satisfactory operation of the complete system. The engine
run lever and the engine stop lever are two Cummins supplied pieces that control the engine
speed.
The engine run lever (6) is a factory preset throttle control that should not be tampered with. It is
set to run wide open.
The engine stop control lever (3) linkage along with the hobart installed governor actuator (1) is
used to control the engine speed only. These two items (1 and 3) should be used for governor
adjustment only.
Two definite rules must be followed in making the adjustment:
• Adjust linkage to use the full travel of the threaded rod (2) and the engine stop lever (3).
• Linkage must move engine stop lever (7) from no fuel to maximum speed (2750 rpm)
position, or very close to maximum speed position to allow engine to pull 125% load.
November 27/1997
Cummins
In-line 6 cylinder, 4 cycle diesel
6BT5.9C165
2400 RPM
850 +/- 50 RPM
approximately 2750 +/- 75 RPM
1-5-3-6-2-4
automotive type
45 to 50 PSI (310.3 to 620.5 kPA
160º F to 200º F
(71º C to 93º C)

Engine Specifications

Figure 2
Chapter 2-3
Page 11