PUMP GP-GOV & FUEL INJ 6N6214 - Caterpillar

Hydraulic oil pressure can remain in the hydraulic systems after the engine and pump have been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic systems. To prevent possible injury, refer to the section, Testing and Adjusting, "Hydraulic System Pressure - Release" before any fitting, hose or component is loosened, tightened, removed or adjusted.When possible, the bucket or attachment must always be lowered to the ground before service is started. When it is necessary for the boom to be in the raised position while tests or adjustments are done, be sure that the boom, stick and bucket or attachment have correct support.The swing lock (if equipped) must be engaged before service is started.Always move the machine to a location away from the travel of other machines. Be sure that other personnel are not near the machine when the engine is running and tests or adjustments are being made.
Illustration 11 g01099937
Remove the dust caps from the male coupling of the quick disconnect. Remove the dust caps from the female coupling of the quick disconnect. Carefully clean all mating surfaces of the coupling for the quick disconnect.
Hold the flat face of the female end (C) of the coupling against the male end (A) of the coupler. Hold the female end (C) forward and rotate the main sleeve (D) clockwise.
Continue the manual connection if pressure is not felt. If pressure is detected use an open wrench and turn the coupler clockwise until the connection is completed. The completed connection is determined by the automatic feed of the sleeve (B). This will prevent the incidental loosening of the hose due to vibration.
Connect the male dust caps and the female dust caps together.Note: Always connect the dust cap to another dust cap when the coupling for the quick disconnect is active. This keeps dirt and other foreign material from contaminating the hydraulic system.
Remove the caps and the plugs from the hydraulic fittings.
Install the bolts, clamps, and the hydraulic hoses for the ball valves (20) that are located on the boom foot.
Open the four ball valves (20) .Purging the Hydraulic Circuits
After the assembly of the front parts and reconnection of the hydraulic lines, it is necessary to purge all of the hydraulic lines.Special attention should be given to the following hydraulic lines:
Load sensing line from the fore boom valve
Two pilot lines from the fore boom valve
Pilot line from the stick lowering control valveyesIn order to improve the purging process, nipples have been installed on some hydraulic lines.
Illustration 12 g01257563
Illustration 13 g01105452
When the boom foot has been connected to the boom nose, loosen screw (26) and nipple (25) of the load sensing lines that are located at the bottom of boom foot (12) .In order to purge the lines, connect hose (H), connector (I) and coupler (J) to the nipples.Note: Store the items in the storage box of the machine.
Illustration 14 g01257567
(23) Plug (24) Nipples (11) Boom nose (C) Fore boom cylinder (D) valve
Loosen plug (27) on valve