ELBOW 2175604 - Caterpillar

Table 1
Specifications    
980M     27580 700 kPa (4000 101 psi)    
982M    
27580 700 kPa (4000 101 psi)    
Table 2
Required Tools    
Part Number     Description    
198-4240 (1)     Digital Pressure Indicator    
( 1 ) The 8T-0860 Pressure Gauge is also available.
Illustration 1 g00460133
Steering Frame Lock in the LOCKED Position
Move steering frame lock (1) to the LOCKED position.
Engage the parking brake. Move the transmission direction selector to the NEUTRAL position.
Operator present in seat.
The left armrest must be down.Note: If the optional steering wheel is equipped on your machine, the left armrest position switch enabled condition will NOT apply.
Illustration 2 g01099999
Location of hydraulic service center
Illustration 3 g02507236
Right side view of fan brake pilot control manifold (2) Steering pump supply pressure tap
Attach a 0 to 40000 kPa (0 to 5800 psi) pressure gauge to pressure tap (2) . Pressure tap (2) is located on the right side of the machine in the hydraulic service center on the left side of the control manifold.
The engine should be at high idle throughout the warm-up procedure. Continuously stall the TILT BACK position while simultaneously raising the lift arms at full speed. When the lift arms are almost raised, cycle the tilt cylinder to the FULL DUMP position. Then cycle to the TILT BACK position. Continuously stall the TILT BACK function and simultaneously lower the lift arms back to ground level. Without stalling the rack back function, cycle lift function to raise and lower the lift arms. This procedure will allow the pump to operate at low pressure and circulate oil through out the system. Repeat this procedure until the hydraulic oil is at 62° 8°C (143.6° 14.4°F).
After the oil has reached normal operating temperature, position the bucket and any attachments slightly off the ground. Run the engine at high idle.Note: During the following step, do not keep the steering pump at stall condition for more than 10 seconds. If necessary, release the STIC steering control lever or optional steering wheel and wait for 30 seconds before you repeat the step.
Move the STIC steering control lever or optional steering wheel to the right to command full articulation. Continue to move the STIC steering control lever or optional steering wheel in the full articulation position to obtain a reliable pressure reading.
Record the pressure reading on the pressure gauge. Refer to Table 1.
Lower the work tool to the ground. Stop the engine.
Relieve the hydraulic pressure.ReferenceFor the correct procedure to relieve any hydraulic oil pressure that may be in the steering system, refer to the Service Manual module for Testing and Adjusting, "System Pressure - Release" for the machine that is being tested.
If the pressure reading is correct, remove the hose assembly and the pressure gauge from pressure tap (2) .
When the compensator is rebuilt, make sure that the pressure compensator adjustment is backed out to a low pressure setting before the engine is started. Otherwise, severe pump and system damage can result.
Adjusting the Steering Pressure Compensator Valve
Illustration