PUMP GP-ENGINE OIL 3460737 - Caterpillar

CROSS SECTION OF BALL RESOLVER VALVE
15. Ball resolver valve. 20. Flow control dampening pin.
LEFT HAND NEUTRALIZER VALVE
4. Plug. 5. Reverse flow ball check. 10. Ball check valve.C. The amount of pull needed to turn the steering wheel must be low; 18 to 22 lb. in. (20.7 to 25.4 cm.kg) with warm oil and the wheel is turned at a rate of 15 to 20 seconds per revolution.D. Pilot flow at the opened lines must be smooth and free of air when the steering wheel is turned at 2 to 3 seconds per revolution.E. Connect fittings removed in Step IIIA.IV. The HMU can cause the following problems: A. Steering wheel turns by itself with the engine running.
RIGHT HAND NEUTRALIZER VALVE
9. Plug. 11. Ball check valve.1. HMU is dirty causing the sleeve valve to stick. (The pull needed to turn the steering wheel is usually higher than normal). If there is dirt or foreign material in the HMU, the rest of the hydraulic system should be flushed.2. The length of the bolts holding the HMU to the steering column is too long. These bolts may not be tightened evenly. The surfaces of the HMU and the part it is mounted on are not flat.3. The centering springs (7J8010) in the HMU are broken.4. The sleeve valves in the HMU have too tight a fit.B. Steering wheel is hard to turn with the engine running. 1. Steering wheel steers difficult with cold oil but becomes easier to steer as oil warms up.2. Check the pilot lines for restrictions.3. The bolts (7J6835) in the HMU assembly are too tight or have not been tightened evenly. Correct torque is 20 1 lb.ft. (2.8 0.14 mkg).4. Steering pump has a defect. Flow should be 23.0 U.S. gpm, (87.1 lit/min) at 1000 psi (70.0 kg/cm2) and 2000 rpm.5. The clearance between ball check valve (10) and spring pin is too small. The minimum measurement is .10 in. (2.54 mm).6. The timing on the HMU drive is not correct. Drive pin (7J8009) must be parallel with the groove in the star gear.C. Steering wheel is hard to turn when machine is against one of the stops (neutralizer valves).The clearance between the reverse flow ball check valves (11) or (5) and spring pin is too small. The minimum measurement must be .10 in. (2.54 mm).V. Troubleshooting the Steering Control Valve (Engine must be at High Idle unless a different indication is given). A. Machine steering is correct with an empty bucket but it steers slow when the bucket is loaded or the brakes are being used. 1. The fit between flow control valve (16) and body of the steering control valve (7) is too loose.2. One or both of the seats in the ball resolver valve (15) has a leak. a. If steering is slow in both directions, both seats have a defect or the fit between flow control valve (16) and body of the steering control valve (7) is too loose. The flow control