HOSE AS 2988516 - Caterpillar

Illustration 4 g00686994
Locations of Toggle Switches (1) Toggle switch (Grapple CLOSE). (2) Toggle switch (Grapple OPEN).
Press toggle switch (1) .Note: This step is required to upstroke the implement pump. The oil pressure cannot be accurately set unless the implement pump is upstroked.
Illustration 5 g00740724
Top View of Main Control Valve ( HH55/HH65) (3) Stud for the feed roller arm cylinders. (4) Adjustment screw for signal limiter valve (CLOSE position). (5) Adjustment screw for signal limiter valve (OPEN position).
Illustration 6 g00740807
Top View of Main Control Valve ( HH75) (1) Stud for the feed roller arm cylinders. (2) Adjustment screw for signal limiter valve (CLOSE position). (3) Adjustment screw for signal limiter valve (OPEN position).
Place a wrench on stud (3). Slowly turn the wrench to the DOWN position. The feed roller arm will close. The pressure will be indicated on the pressure gauge.Note: When you are adjusting the oil pressure to the feed roller arm cylinders, refer to Table 2 for the maximum pressure setting. The pressure should not be adjusted above the pressure setting in the table.
Turn adjustment screw (4) in the clockwise direction in order to increase the maximum pressure of the feed roller arm on the tree. Turn adjustment screw (4) in the counterclockwise direction in order to decrease the pressure. Refer to Table 2 for the correct pressure.
Slowly turn the wrench to the UP position. The feed roller arm will open. The pressure will be indicated on the pressure gauge.
Turn adjustment screw (5) in the clockwise direction in order to increase the maximum pressure. Turn adjustment screw (5) in the counterclockwise direction in order to decrease the maximum pressure. Refer to Table 2 for the correct pressure.
Lower the harvester head to the ground. Lower the hydraulic activation control lever. Turn the attachment switch to the OFF position. Stop the engine. Remove the pressure gauge. Remove the adapter if an adapter was installed. Connect the electrical connector.
Table 2
PRESSURES FOR FEED ROLLER ARM CYLINDERS    
Harvester Head     Signal Pressure    
OPEN Position    
HH55 and HH65    
12500 kPa (1813 psi)    
HH75    
10000 kPa (1450 psi)    
CLOSE Position    
HH55 and HH65    
19000 kPa (2755 psi)    
HH75    
16000 kPa (2320 psi)    Setting Speed of Feed Roller Arms
Start the engine. Turn the engine speed dial to position "7". Raise the hydraulic activation control lever. Turn the attachment switch to the ON position. Raise the harvester head approximately 0.3 m (1 ft) above the ground.
Illustration 7 g00686994
Locations of Toggle Switches (1) Toggle switch (Grapple CLOSE). (2) Toggle switch (Grapple OPEN).
Press toggle switch (2). The feed roller arms will open. Measure the time that is required for the feed roller arms to open.
Press toggle switch (1). The feed roller arms will close. Measure the time that is required for the feed roller arms to close.The speeds must meet the following criteria. If the speeds do not meet the criteria, perform Step 4 through Step 9 in order to adjust the speed. If the speeds meet the criteria proceed