CARTRIDGE KIT 6J3138 - Caterpillar

Introduction
The following procedure is used in order to test the main relief valve.Required Tools
Illustration 1 g02110753
Typical electric hydraulic pump group (F) with pressure gauge (G).
Illustration 2 g02110814
Test manifold block (H)
Table 1
Tool Part Number Description Qty
F 3S-6224 Electric Hydraulic Pump Gp 1
G 8T-0860 Pressure Gauge (0 to 40,000 kPa (0 to 5,800 psi)) 1
H 257-5616 Test Manifold Block 2
J 5P-1838 Adapter 2
K 1P-2375 Quick Connect Coupler 2
L 1P-2376 Quick Connect Coupler 2
M 8F-0024 Hose As 2
N 3B-7722 Pipe Bushing 1
P 7J-8611 Pipe Elbow 2 Test Procedure
Note: The main relief valve should only be tested on a test bench. Use test manifold block (H) in order to test the main relief valve.
Illustration 3 g03603856
(1) Control manifold
(2) Main relief valve
Remove main relief valve (2) from the control manifold (1).
Secure test manifold block (H) in a suitable holding device.
Install two adapters (J) and two quick connect couplers (K) in test manifold block (H).
Attach two quick connect couplers (L) to two hose assemblies (M).
Illustration 4 g02110866
Typical electric hydraulic pump group (F) with pressure gauge (G).
Connect two hose assemblies (M), two pipe bushings (N), and pipe elbow (P) to electric hydraulic pump group (F).
Connect pressure gauge (G) to electric hydraulic pump group (F).
Illustration 5 g02286413
(2) Main relief valve
(2A) Nut
(2B) Retainer
(H) Test manifold block
(aa) Port for the return oil
(bb) Port for the pressure line from electric hydraulic pump group (F)
Install main relief valve (2) into test manifold block (H).
Install oil return line to port (aa).
Install the pressure oil line from electric hydraulic pump group (F) to port (bb).Note: Ensure that the hose assemblies are connected to the proper test port. If the lines are not connected correctly, the relief valve setting will be incorrect.
Turn electric hydraulic pump group (F) into the ON position. Check for leaks at any of the connections.
The 3S-6224 Electric Hydraulic Pump only has a 7.6 L (2 US gal) reservoir. Pump damage may result if the pump is operated with an empty reservoir.
Slowly increase the pressure. Record the pressure when the main relief valve opens.
Shut off electric hydraulic pump group (F).The correct pressure setting for main relief valve (2) is 27600 400 kPa (4000 60 psi) at a flow of 4.0 L/min (1.10 US gpm). If the pressure setting is within the specified pressure range, install the main relief valve back into control manifold (1).Adjustment Procedure
Illustration 6 g02286414
(2) Main relief valve
(2A) Nut
(2B) Retainer
If the pressure setting is not within the specified pressure range, loosen nut (2A) and turn retainer (2B) in order to adjust the pressure setting. Turning the retainer clockwise will increase the relief valve pressure setting. Turning the retainer counterclockwise will reduce the relief valve pressure setting.Note: If the specified relief valve pressure setting cannot be achieved, the relief valve may need replaced.
Repeat Step 10 through Step 1 until the specified setting is reached.
Install main relief valve (2) back into control manifold (1).