PRECLEANER A 8N1977 - Caterpillar

Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin.
Once both pumps have been tested, reduce all pressures, electrical current, and input speed to zero. Allow the component to cool. Drain the component of oil. Cap or plug all of the ports. Remove the component from the test bench.
Table 3
Part Number 524-2648
Pump Rotation Clockwise
Step 1 2a 2b 2c 2d 3a 3b
RPM 600 1200 1200 1200 1200 1200 1200
Power Shift Pressure kPa (psi) 0 1300 (190) Vent port (55) to atmosphere
Power Shift Solenoid Current mA 0 0 500 500 500 0 0
Negative Flow Control Pressure kPa (psi) Vent ports (56) and (57) to atmosphere 1100 (160) 3660 (530)
Discharge Pressure kPa (psi) 0 0 19500 (2830) 24500 (3550) 34500 (5000) 7000 (1015)
Discharge Flow lpm (gpm) 70 (18) 140 3 (36 1) 88 6 (23 2) 67 6 (17 2) 42 6 (11 2) 140 3 (36 1) 21 3 (5.5 1)
Standby Pump Negative Flow Control Pressure kPa (psi) 0
Standby Pump Discharge Pressure kPa (psi) 0
Standby Pump Discharge Flow lpm (gpm) 70 (18) 140 (36)
Pilot Pump Discharge Flow lpm (gpm) 6 (1.6) 12 (3.2) 12 (3.2) 12 (3.2) 12 (3.2) 12 (3.2) 12 (3.2) Test Bench Tooling
Table 4
Part Number Mounting Flange Drive Adapter Suction Adapter Split Flange Flange Adapter Power shift Port Negative Flow Ports Case Drain Port
524-2648 131-8477 131-6456 1U-9874 8T-9403 9U-7438 9/16-18 STOR 9/16-18 STOR 1 1/16-12 STOR