FILM 2088958 - 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 attachments have been lowered, 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 Tools and Shop Products Guide" 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     8T-5320     Hydraulic Test Group     2    
B     0S-1591     Bolt     8    
C     6V-4143     Coupler     2    
D     8T-4188     Union Adapter     2    
E     198-4240     Digital Pressure Indicator     1    
Illustration 1 g01124676
Hitch Between the Tractor and the Scraper (Left Side) (1) Hose
Disconnect both hoses (1) from one steering cylinder.
Install the appropriate plate assemblies from Tooling (A) beneath the front hose flange and the rear hose flange. Use Tool (B) in order to attach the plate assemblies.
Assemble the following components and connect to the plate assemblies: Tool (C), Tool (D) and Tooling (E) .
Start the engine and operate the engine at low idle. Check the pressure readings on the two pressure gauges. The pressure reading should be 380 100 kPa (55 15 psi) for each pressure gauge.
The difference between the pressure in the right cylinder and the pressure in the left cylinder cannot exceed 35 kPa (5 psi). If the pressure is out of tolerance, complete the following procedure.
Illustration 2 g00378123
(2) Steering control valve (3) Cover (4) Spacers (5) Shims
Remove cover (3) from steering control valve (2) .
Add shims (5) if the pressure for a left turn is higher than the pressure for a right turn. Remove shims (5) if the pressure for a left turn is lower than the pressure for a right turn. Refer to Specifications, "Steering Control Valve" for