HARNESS AS-ENGINE 3437235 - Caterpillar

Introduction
The pilot pump is a gear pump that supplies oil flow to the pilot system. The pilot pump is located inside the main pump compartment and mounted externally to the main pump. This test is used to measure pump flow at the pilot pump.Required Tools
Illustration 1 g01455422
Flow meter tool layout
(1) Swing motor
(2) Connector at swing motor
(3) 6V-9840 Swivel Tee
(4) Makeup line (swing motor)
(6) 6V-9509 Face Seal Plug
(7) 436-8662 Portable Hydraulic Tester (Flow meter)
(8) Pilot line (delivery line from the pilot pump to pilot filter)
(9) Connector at pilot pump
(30) 5K-9090 O-Ring Seal
(31) 5P-0201 Hose
(32) 5P-1010 Sleeve
(33) 4C-8767 Coupling
(34) 7M-8485 O-Ring Seal
(35) 4C-6481 Coupler Assembly
(36) 4C-6482 Nipple Assembly
(37) 4I-6141 Coupling
(38) 8C-9026 Adapter
(39) 6K-6307 O-Ring Seal
(40) 6V-9854 Swivel Elbow
(47) 4I-6140 Coupling
(48) 8C-8762 Elbow
(49) 6V-8398 O-Ring Seal
Illustration 2 g01593155
Circuit diagram
(1) Swing motor
(2) Connector
(3) Tee
(4) Makeup line
(5) Main control valve
(6) Plug
(7) Portable hydraulic tester
(8) Pilot line
(9) Connector at pilot pump
(10) Pilot filter
(12) Engine
(13) Multitach group
(14) Pilot pump
(40) Elbow Machine Preparation
To prevent personal injury or equipment damage from failure of the hydraulic test equipment or associated circuit components because of blocked pump flow, make sure that the test equipment valves are fully open before starting the engine.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
Position the machine on level ground.
Stop the engine.
Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "Hydraulic System Pressure - Release".
Attach 311-1362 Vacuum Cap onto the hydraulic tank. Attach an air supply hose onto the assembly. Apply 276 to 414 kPa (40 to 60 psi). This procedure will pull a vacuum on the hydraulic system.
Install the following tools in accordance with the flow meter tool layout and the circuit diagram. Refer to Illustration 1 and Illustration 2.
Install multitach group (13) on engine (12).
Remove pilot line (8) from connector (9) at pilot pump (14).
Install seal (49) and plug (6) to the end of pilot line (8).
Install seal (49) and elbow (48) to connector (9) at pilot pump (14).
Install seal (49), coupling (47), seal (34) and nipple assembly (36) to elbow (48).
Illustration 3 g00669270
Right swing motor
(1) Swing motor
(2) Connector
(3) Tee
(4) Makeup line
(40) Elbow
Disconnect makeup line (4) from connector (2) at swing motor (1).
Assemble and install seals (30), tee (3), swivel elbow (40) and coupling (37) to connector (2) at swing motor (1).
Remove 311-1362 Vacuum Cap and install the filler plug for the hydraulic tank.
Connect portable hydraulic tester (7) and test hoses between nipple assembly (36) at the pilot pump and coupling (37) at the swing motor. Test Procedure
Note: Certain machines will default to "Economy Mode" at machine startup. Change to "High