349F and 352F Excavators Hydraulic System Caterpillar

Swing Motor - Test - Measurement of Case Drain Oil

Usage:

Show/hide table

Table 1
"Swing Motor - Test (Measurement of Case Drain Oil)" for 334-9975 Swing Motor Gp
Machine Settings	Swing Relief Pressure		Engine Speed
Machine Settings	31400 ± 1000 kPa (4554 ± 145 psi)		Engine speed dial "10" AEC Switch OFF
Item	Specification⁽¹⁾	Actual
Item	Specification⁽¹⁾	Right Swing Motor	Left Swing Motor
New Swing Motor	30 L/min (7.9 US gpm)	1.	1.
		2.	2.
		3.	3.
Rebuilt Swing Motor	35 L/min (9.2 US gpm)	1.	1.
		2.	2.
		3.	3.

Show/hide table

⁽¹⁾	Maximum acceptable flow

Show/hide table

Table 2
"Swing Motor - Test (Measurement of Case Drain Oil)" for 486-5236 Swing Motor Gp
Machine Settings	Swing Relief Pressure		Engine Speed
Machine Settings	29000 ± 1000 kPa (4206 ± 145 psi)		Engine speed dial "10" AEC Switch OFF
Item	Specification⁽¹⁾	Actual
Item	Specification⁽¹⁾	Right Swing Motor	Left Swing Motor
New Swing Motor	30 L/min (7.9 US gpm)	1.	1.
		2.	2.
		3.	3.
Rebuilt Swing Motor	35 L/min (9.2 US gpm)	1.	1.
		2.	2.
		3.	3.

Show/hide table

⁽¹⁾	Maximum acceptable flow

Use the following procedure to measure the case drain of the swing motor.

Show/hide table

NOTICE

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.

Show/hide table

Show/hide table

Table 3
Tool	Item	Qty	Part Number	Description
D	D1	1	6V-7788	Flow Meter 5 to 60 L/min (2 to 15 US gpm)
	D2	1	8C-6874	Connector
	D3	1	6V-9746	O-Ring Seal
	D4	1	124-1921	Permanent Coupling
	D5	3 ft	122-6872	Bulk Hydraulic Hose
	D6	1	124-2153	Permanent Coupling
F		1	311-1362	Vacuum Cap

Position the machine on level ground.
Stop the engine.
Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "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.
Show/hide table

Illustration 2 g02148661

(1) Right swing motor
(2) Left swing motor
(3) Elbow
(4) Connector
(5) Case drain hose
(6) Tee
(7) Swivel

Disconnect case drain hose (5) from elbow (3) to test the right swing motor. Disconnect tee (6) from connector (4) to test the left swing motor.

Show/hide table




Illustration 3	g02148669
Flow Meter Tool Layout (1) Right swing motor (2) Left swing motor (3) Elbow (4) Connector (5) Case drain hose (6) Tee (7) Swivel (D1) Flow Meter (D2) Connector (D3) O-Ring seal (D4) Permanent coupling (D5) Hose (D6) Permanent coupling

Install the following tools in accordance with the flow meter tool layout. Refer to Illustration 3.
Connect the flow meter assembly (D) between elbow (3) and case drain hose (5) to test the right swing motor. Connect the flow meter assembly (D) between tee (6) and connector (4).
Note: Correct orientation of the flow meter is necessary. The oil flows from the swing motor.
Remove 311-1362 Vacuum Cap.
Show/hide table

Illustration 4 g02148684

Pilot Manifold
(8) Solenoid valve for swing parking brake
(9) Connector
Disconnect connector (9) from the solenoid valve for swing parking brake (8).

Start the engine.
Place the machine controls at the following settings: engine speed dial "10" and AEC switch OFF. Refer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for engine rpm settings.
Place the hydraulic activation control lever in the UNLOCKED position.
Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
Slowly move the swing joystick and make sure that the swing brake is activated.
Move the swing joystick for a full SWING RIGHT. Measure the case drain oil. Refer to Table 1 or Table 2.
Stop the engine.
Connect connector (9) to the solenoid valve for the swing parking brake (8).
Repeat this test procedure three times to obtain three measurements of case drain oil. For each test procedure, swing the upper structure to a different position.