CYLINDER HEAD AS 1446409 - Caterpillar

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.
Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine.To prevent possible injury, perform the procedure that follows before testing and adjusting the brake system.
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, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
Introduction
The following procedure will release the pressure in the braking system.Required Tools
Table 1
Required Tools
Tool Item Qty Part No Description
B B1 1 8T-0859 Pressure Gauge
( 0 kPa to 25000 kPa (0 psi to 3600 psi))
B2 1 6V-3989 Fitting
B3 2 6V-4143 Quick Connect Coupler
B4 1 177-7861 Hose As
4.3 m (14 ft)
Illustration 1 g02726620
(B) ToolingTest Preparation
Move the machine to a hard, level surface.
Engage the parking brake. Stop the engine.
Illustration 2 g02942337
(1) Service brake pedal
Depress service brake pedal (1) at least 80 times to release oil pressure from the brake accumulator.
Illustration 3 g02942338
(2) Service brake pressure gauge for the front brakes
(3) Service brake pressure gauge for the rear brakes
Check the readings on front service brake pressure gauge (2) and rear service brake pressure gauge (3) on the dash panel in the operator station. The brake pressure gauges should read 0 kPa (0 psi) when the service brake pedal is depressed.
Illustration 4 g06250241
(4) Pressure tap (brake accumulator oil)
If the brake pressure gauges are not fitted, connect Tooling (B) to pressure tap (4). Check the reading on the pressure gauge. The pressure gauge should read 0 kPa (0 psi) when the service brake pedal is depressed.
If the pressure on any of the gauges does not read 0 kPa (0 psi), repeat Steps 3 through 6.