HOUSING AS 4W6677 - Caterpillar

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Table 2
Tool Item Qty Part Number Description
A A1 1 8T-0856 Pressure Gauge
(0 kPa to 6,000 kPa (0 psi to 870 psi))
A2 1 6V-3989 Fitting
A3 2 6V-4143 Quick Connect Coupler
A4 1 177-7860 Hose As
(3.0 m (10 ft))
B B 198-4240 Digital Pressure Indicator Gp
B1 1 198-4234 Digital Indicator
B2 1 198-4237 Pressure Sensor Gp
(0 kPa to 3,445 kPa (0 psi to 500 psi))
B3 1 198-4236 Adapter Cable As
C C 1 IBM Compatible PC
C1 1 466-6258 Communication Adapter Gp
C2 1 ET Software (1)
(1) Version ET2015C or newerLock Differential Using Cat ET
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(A) Service connector for the Caterpillar Electronic Technician
Using tooling C, connect a laptop to the service connector (A).
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Open the software program (ET). Select "Transmission" from the "ECM Selector" menu.
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Select the "Service" menu item from the toolbar. Select the "Configuration" menu item.
Highlight the "Axle and Brake Parameters" on the configuration screen..
Select the differential and lock the differentials.Differential Lock Engagement Check
Safely remove frame lock. While machine is in forward motion and turning machine left or right.If machine travel becomes rough due to the wheels dragging. The differentials are engaging.
Do not operate machine for an extended period with the differential lock over ridden.
Machine Preparation
Operate the machine until the transmission oil at the sump is at operating temperature of 76° 7°C (169° 13°F). Operate the machine until the hydraulic oil is at operating temperature of 62° 8°C (144° 14°F).
Locate the machine on a hard level surface. Engage the parking brake. Shut off the engine.
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The front differential lock pressure tap is located inside the non-engine frame. The tap is mounted to the left-hand side of the machine.
(13) Front differential lock pressure tap
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The rear differential lock pressure tap is located under the cab, on the engine frame. The tap is mounted to the right-hand side of the machine, near the right-hand steering neutralizer .
(14) Rear differential lock pressure tapNote: The rear differential lock is an attachment.
Remove the dust cap. Attach Tooling (A) to the test port.Test port (13) is for the front axle. Test port (14) is for the rear axle.Note: Rear differential lock is an attachment.Test Procedure
Start the engine and run the engine at low idle.
Place transmission in second neutral.
Measure pressure at low idle. Transmission in second neutral and differential locked. No steering or implement commands allowed during test. Ensure that the pressure for each axle is within the limits listed in Table 1.
The gauge should read 3100 300 kPa (450 45 psi).
If the differential lock valve appears to be working properly, the differential lock clutch may need serviced.
Shut off the engine. Remove the test equipment. Remove ET over ride of differential lock.