HOOD GP-ENGINE 1364708 - Caterpillar

Table 2
Test Pressures For Pump Synchronization    
Axle Pump     Drum Pump     Speed and Direction    
Low High    
Fwd Rev     Fwd     Rev    
(5)     -     1000     (1)     1100     (1)    
-     (3)     900     (1)     1050     (1)    
(1)     -     (1)     850     (1)     1000    
-     (2)     (1)     1000     (1)     1100    
( 1 ) Charge PressureNote: The values that are shown above are for example only. The actual pressures will vary depending on the type of soil and the looseness of the soil.Note: The pressures for the drum propel pump and the axle propel pump should match within 1500 kPa (218 psi). If the values do not match, the following adjustments may be made.
Illustration 2 g00455352
Propel Pumps (6) External linkage rod.
Remove linkage (6) between the two manual displacement control levers. Both pump levers are spring centered to the neutral position. Adjust the length of the rod in order to allow the rod to drop onto the manual displacement control levers.
Illustration 3 g00455446
Axle Motor (7) Minimum displacement adjustment screw. (8) Maximum displacement adjustment screw.
Illustration 4 g00455445
Drum Drive Motor (9) Minimum displacement adjustment screw. (10) Maximum displacement adjustment screw.
If the pressure differential is greater than 1500 kPa (218 psi) in HIGH SPEED, adjust the minimum displacement of the motor. Adjust the motor which has the lower system pressure by turning minimum displacement adjustment screw (7) or (9) out one half turn at a time. This will decrease the motor displacement. At this point, the pressure differential should decrease. Note: In order for the pressure to operate within 1500 kPa (218 psi), tests have shown that the minimum displacement adjustment screw and the maximum displacement adjustment screw should be set to the following dimensions:Note: These settings for the adjustment screw are only approximate dimensions. Each machine may need to be individually adjusted.
Table 3
Typical Settings For Displacement Screws On The Propel Motors    
Displace-
ment     Total length of displace-
ment
screw     Drum Drive Motor     Axle Motor    
A B     A     B    
Minimum     70 mm     10.2 mm     -     10.2 mm     -    
80 mm 20.2 mm     -     20.2 mm     -    
90 mm 30.2 mm     -     30.2 mm     -    
Maximum     50 mm     -     10.3 mm     -     10.3 mm    
60 mm -     20.3 mm     -     20.3 mm    
70 mm -     30.3 mm     -     30.3 mm    
If the machine develops system pressure in NEUTRAL, refer to Testing and Adjusting, "Piston Pump Neutral - Test and Adjust".Note: System pressure should normally be greater than charge pressure. If the machine is going forward and the charge pressure is greater than the system pressure, there may be an electrical problem or a mechanical problem within the