3408 & 3408B DIESEL TRUCK ENGINE Caterpillar


Governor

Usage:




Later Governors

NOTE: Any adjustment to the governor must be made only by a person approved by Caterpillar or by a Caterpillar Dealer.

(1) Torque for nut ... 12 ± 4 N·m (9 ± 3 lb.ft.).

(2) 6N8793 Spring:

Length under test force ... 19.05 mm (.750 in.)

Test force ... 2.00 ± 0.13 N (.45 ± .03 lb.)

Free length after test ... 41.9 mm (1.65 in.)

Outside diameter ... 9.40 mm (.370 in.)

(3) Seat. Install a spring washer, flat washer and spring washer between seat (3) and spring (4) as shown.

(4) 9L6449 Spring for the governor:

Color code ... one green stripe, one brown stripe

Put force on spring of ... 22 N (5 lb.)

Then add more force to make spring shorter by ... 22.86 mm (.900 in.)

Total test force ... 86.6 ± 1.8 N (19.4 ± .4 lb.)

Free length after test ... 56.9 ± 1 mm (2.24 ± .04 in.)

Outside diameter ... 35.23 mm (1.387 in.)


Install Spring Washers As Shown

(4) 9L6448 Spring for the governor:

Color code ... one green stripe, one yellow stripe

Put force on spring of ... 22.24 N (4.00 lb.)

Then add more force to make spring shorter by: ... 22.86 mm (.900 in.)

Total test force ... 73.00 ± 1.50 N (16.60 ± .30 lb.)

Free length after test ... 56.9 ± 0.8 mm (2.24 ± .03 in.)

Outside diameter ... 35.3 mm (1.39 in.)

(5) 9M6303 Spring:

Length under test force ... 4.57 mm (1.80 in.)

Test force ... 45 ± 4 N (10 ± 1 lb.)

Free length after test ... 8.74 mm (.344 in.)

Outside diameter ... 12.19 mm (.480 in.)

(6) Diameter of the outer surface of the cylinder (new) ... 38.100 ± 0.013 mm (1.5000 ± .0005 in.)

Bore in the gear (new) ... 38.151 ± 0.013 mm (1.5020 ± .0005 in.).

(7) Put marks in alignment on pinion-stop and gear before installing dowel.

(8) Bore in the bearing (new) ... 22.263 ± 0.038 mm (.8765 ± .0015 in.)

Diameter of the gear at the hub (new) ... 22.187 ± 0.013 mm (.8735 ± .0005 in.).


Earlier Governors


Governor Plate

(9) Distance from the face of the plate to the bearing for the governor drive assembly ... 0.51 ± 0.25 mm (.020 ± .010 in.).

(10) Dowel installation:

Angle A must be ... 54 ± 10°

Dimension B must be ... 7.9 ± 0.5 mm (.31 ± .02 in.)

(11) Install dowels to get a dimension of ... 5.6 ± 0.5 mm (.22 ± .02 in.).


Control Shaft Bearings

(12) Bore in the governor control shaft bearings (after assembly) ... 15.761 ± 0.038 mm (.6205 ± .0015 in.)

Diameter of the governor control shaft (new) ... 15.720 ± 0.008 mm (.6189 ± .0003 in.)

(13) Distance between the bearings for the governor control shaft ... 60.58 ± 0.13 mm (2.385 ± .005 in.)

(14) Distance from the face of the housing to the end of the bearing for the governor control shaft ... 43.38 ± 0.15 mm (1.708 ± .006 in.)


Shutoff Shaft Bearings

(15) Bore in the shutoff shaft bearing (new) ... 12.713 ± 0.013 mm (.5005 ± .0005 in.)

Diameter of the shutoff shaft (new) ... 12.637 ± 0.013 mm (.4975 ± .0005 in.)

(16) Torque for insulator ... 4.5 ± 0.6 N·m (40 ± 5 lb.in.)

(17) Needle bearing.

(18) Distance from center of bolt hole to outside end of needle bearing (17) ... 92.86 ± 0.25 mm (3.656 ± .010 in.)

(19) Distance from end of needle bearing (17) to inside of sleeve bearing ... 98.68 ± 0.25 mm (3.885 ± .010 in.)

Install seals as shown.

Maximum end play for shaft ... 1.02 mm (.040 in.)


Earlier Governor Housing

(20) Torque for plug ... 37 ± 7 N·m (27 ± 5 lb.ft.)

(21) 1S9312 Spring for speed limiter:

Length under test force ... 21.84 mm (.86 in.)

Test force ... 10.59 ± 0.85 N (2.38 ± .19 lb.)

Free length after test ... 66.5 mm (2.62 in.)

Outside diameter ... 17.04 mm (.671 in.)

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