BAR 1V6354 - Caterpillar

Test Preparation
Reference: Refer to Testing and Adjusting, "System Pressure - Release" for the correct procedures for relieving hydraulic oil pressure.
Illustration 1 g06081644
Install the steering frame lock into the LOCKED position.Required Tools
Illustration 2 g02110753
Typical electric hydraulic pump group (F) with pressure gauge (G).
Illustration 3 g03777913
Test manifold block (H)
Table 3
Required Tooling
Tool Qty Part Number Description
F 1 3S-6224 Electric Hydraulic Pump Gp
G 1 8T-0860 Pressure Gauge (0 to 40,000 kPa (0 to 5,800 psi))
H 2 474-8877 Test Manifold Block
J 2 5P-1838 Adapter
K 2 1P-2375 Quick Connect Coupler
L 2 1P-2376 Quick Connect Coupler
M 2 8F-0024 Hose As
N 1 3B-7722 Pipe Bushing
P 2 7J-8611 Pipe Elbow Test Procedure
Illustration 4 g06086602
Steering Control Valve
(1) Control manifold
(2) Crossover relief valve
(2A) Adjustment screw
(2B) Nut
Remove crossover relief valve (2) for the steering cylinder work port. Crossover relief valve is located in the steering control valve. The steering control valve is located in front of the transmission housing in the hitch area. The crossover relief valve needs to be bench tested. Remove the valve.
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 5 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).
Illustration 6 g03777936
(2) Steering crossover valve
(2A) Locknut
(2B) Adjustment screw
(H) Test manifold block
(aa) Port for the return oil
(bb) Port for the pressure line from electric hydraulic pump group (F)
Install crossover 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 all 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 crossover relief valve opens.
Shut off electric hydraulic pump group (F).The pressure of the crossover relief valve should be 25,600 1,300 kPa (3,713 189 psi) at a flow rate of 21 2 L/min (5.5 0.5 US gpm). If the pressure setting is within the specified pressure range, install the crossover relief valve back into control manifold (1).Adjust Procedure
Loosen the locknut (2A). Turn the adjustment screw (2B) counterclockwise in order to lower the pressure of the valve. Turn the adjustment screw (2B) clockwise in order to increase the pressure of the valve. Tighten the locknut (2A) to 20 3 N m (15 2.2 lb ft) after the correct pressure is reached. The valve is faulty if the adjustment screw does not affect the pressure.