C2.4 Tier 4 Final Engines for Caterpillar Built Machines Gear Group (Front) Caterpillar


Gear Group (Front)
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C2.4 Tier 4 Final Engines for Caterpillar Built Machines [M0067750]
BASIC ENGINE
GEAR GP
C2.4 Tier 4 Final Engines for Caterpillar Built Machines Gear Group (Front)
1.1. Side Clearance of Idler Gear
2.1. Oil Clearance between Idle Gear Shaft and Idle Gear Bushing


Illustration 1g02807659
(1) Injection Pump Gear
(2) Idler Gear
(3) Camshaft Gear
(4) Crankshaft Gear
(5) Oil Pump Drive Gear

Table 1
Backlash between the idler gear and the crankshaft gear (New)  0.04150 mm (0.001634 inch) to 0.1122 mm (0.004417 inch) 
Allowable limit  0.15 mm (0.0059 inch) 
Backlash between the idler gear and the camshaft gear (New)  0.04150 mm (0.001634 inch) to 0.1154 mm (0.004543 inch) 
Allowable limit  0.15 mm (0.0059 inch) 
Backlash between the idler gear and the injection pump gear (New)  0.04150 mm (0.001634 inch)to 0.1154 mm (0.004543 inch) 
Allowable limit  0.15 mm (0.0059 inch) 
Backlash between the crankshaft gear and the oil pump gear (New)  0.04150 mm (0.001634 inch) to 0.1090 mm (0.004291 inch) 
Allowable limit  0.15 mm (0.0059 inch) 

Side Clearance of Idler Gear



    Illustration 2g02809716
    (6) Dial Indicator

  1. Set a dial indicator with the point on the idler gear.

  2. Move the idler gear to the front and rear to measure the side clearance.

    Table 2
    Side clearance of idler gear (New)  0.15 mm (0.0059 inch) to 0.25 mm (0.0098 inch)
    Allowable limit  0.9 mm (0.04 inch) 

  3. If the measurement is more than the allowable limit, replace the idler gear collar.

Oil Clearance between Idle Gear Shaft and Idle Gear Bushing



    Illustration 3g02811161
    (7) External Micrometer
    (8) Internal Micrometer

  1. Measure the idler gear shaft outside diameter with an external micrometer.

    Table 3
    Outside diameter of idler gear shaft (New)  37.959 mm (1.4945 inch) to 37.975 mm (1.4950 inch) 

  2. Measure the idler gear bushing inside diameter with an internal micrometer.

    Table 4
    Inside diameter of idler gear bushing (New)  38.000 mm (1.4961 inch) to 38.025 mm (1.4970 inch) 

  3. Calculate the oil clearance.

    Table 5
    Oil clearance between the idler gear shaft and the idler gear bushing (New)  0.025 mm (0.00099 inch) to 0.066 mm (0.0025 inch) 
    Allowable limit  0.10 mm (0.0039 inch) 

  4. If the oil clearance stays more than the allowable limit, replace the idler gear shaft also.

Information System:

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