BUCKET & ADJUSTER GP 3453208 - Caterpillar

Personal injury can result from hydraulic oil pressure and hot oil.Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.
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.
Do not turn the steering wheel when the engine is running and a low pressure gauge has been installed in the steering circuit. If the steering wheel is turned, the pressure of the oil to the steering cylinders will be too high for a low pressure gauge.
Table 1
Required Tools    
Tool    Part Number    Description    Quantity    
A     198-4240     Digital Pressure Indicator Gp     1    
Move the machine to a level, hard surface. Shut off the engine and engage the parking brake.
Illustration 1 g00928778
Rear of 621 and 627 Wheel Tractor-Scrapers (1) Test port for the steering pump for the 621 and 627 Wheel Tractor-Scrapers
Illustration 2 g01125051
Rear of 623 Wheel Tractor-Scraper (1) Test port for the steering pump for the 623 Wheel Tractor-Scraper
Remove the dust cap from test port (1) of the steering pump. Connect the Tooling (A) to test port (1) .
Illustration 3 g00931173
Right side of the steering control valve, underneath operator compartment (2) Test port for the outlet of the steering control valve
Remove the dust cap from test port (2) . Connect the Tooling (A) to test port (1) .
Illustration 4 g00930454
Section view of steering control valve (3) Steering control valve (4) Cover (5) Spacers
Start the engine and operate the engine at HIGH IDLE. Observe the pressure gauge readings. The difference should not exceed 740 kPa (107 psi). If the pressure difference is within tolerance, continue to Step 5. If the pressure difference is out of tolerance, stop the machine and shut off the engine. Complete the following procedure.
Remove cover (4) from steering control valve (3) .
Add spacers (5) in order to increase the pressure difference. Remove spacers (5) in order to decrease the pressure difference.ReferenceRefer to Specifications, "Steering Control Valve" for more information on the spacers.
Install cover (4) to steering control valve (3) .
Purge the steering system.
Repeat Step 4.
Remove all test equipment. Install dust caps on test ports (1) and (2) .
Purge the steering system.ReferenceRefer to Testing and Adjusting, "Steering System - Purge" for more information on purging the steering system.