CONTROL GP-TRANSMISSION 2748987 - Caterpillar

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
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     474-8877     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
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Steering Control Valve (2) Right-hand and Left-hand turn steering work port relief and makeup valves
Remove the steering cylinder work port relief and makeup valves (2) . The steering cylinder work port relief valve and makeup valves are located in the steering control valve. The steering control valve is located in front of the transmission housing in the hitch area. The steering cylinder work port relief and makeup valves need to be bench tested. Remove the valves.
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) .
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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 work port relief 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 steering work port 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 steering work port relief valve opens.
Shut off electric hydraulic pump group (F) .The pressure of the steering work port relief valve should be 30600 400 kPa (4438 58 psi) at a flow of 7.6 L/min (2 US gpm). If the pressure setting is within the specified pressure range, install the relief valve back into control manifold (1) .Adjust Procedure
Loosen the locknut (2A) . Turn the adjustment screw (2B) counterclockwise