SHEET AS-RH 1425805 - Caterpillar

Table 1
Required Tools    
Part Number     Part Description     Qty    
177-7861     Hose As     1    
6V-4143     Couplers     2    
8T-0859     Pressure Gauge (0 TO 25,000-KPA (0 TO 3,600-PSI))     1    
Personal injury or death can result from machine articulation or movement. Machine frames can move and a person can be crushed.Connect the steering frame lock between the front and rear frames before working on the machine.
Personal injury or death can result from escaping fluid under pressure.Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause serious injury and possible death. If fluid is injected into your skin, it must be treated by a doctor familiar with this type of injury.Always use a board or cardboard when checking for a leak.
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, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Illustration 1 g00946827
(1) Steering frame lock
Install steering frame lock (1) so that the machine can not turn.
Illustration 2 g01245527
(2) Pressure tap for the steering system
Remove the protective cover from pressure tap (2). Connect a 177-7861 Hose As and an 8T-0859 Pressure Gauge to pressure tap (2) .
Start the engine. Operate the engine at high idle rpm with the transmission control in the NEUTRAL position.
Turn the machine against the steering frame lock. This will cause the steering relief valve to open.
Observe the reading on the pressure gauge while attempting to turn the machine in both directions. The reading on the pressure gauge should be 17250 550 kPa (2500 80 psi).
Stop the engine.
If the pressure reading is correct, proceed to Step 12. If the pressure reading is not correct, proceed to Step 8.
Illustration 3 g00985717
Steering control valve (3) Locknut (4) Pressure adjusting screw
Loosen locknut (3) .
Turn pressure adjusting screw (4) clockwise to increase the pressure setting and counterclockwise to decrease the pressure setting.
Tighten locknut (3) to a torque of 20 N m (15 lb ft).
Repeat Step 3 through Step 7.
Remove the pressure gauge from the pressure tap. Place the protective cover on the pressure tap.
Remove the steering frame lock.