Situation or Problem
No publication specifies a procedure or allowable specification.

Solution Steps

Step One Place the backhoe or loader boom cylinder in the half-extended position with bucket empty.

Step Two Measure the amount of rod extending from the cylinder.

Step Three Allow the implement to sit undisturbed for 30 minutes.

Step Four Measure the amount of rod that extends from the cylinder again.

Step Five If the rod movement exceeds the maximum allowable travel listed in the charts below, determine if the SCV or the cylinder is leaking excessively by: Stroke the valve to extend the cylinder to full stroke. CAUTION: To avoid possible injury, support the implement before hose removal. Unexpected movement of the implement could occur and result in serious injury, if the wrong hose is disconnected. Make sure the return line is the one being removed. This is the line at the cylinder's rod end when the cylinder is extended. Avoid oil penetration injury when observing for cylinder leakage. Remove the return hose from the cylinder. Stroke the valve in the extend direction again. If oil comes out of the disconnected cylinder fitting, the cylinder is leaking. If oil does not come out of the disconnected cylinder fitting, the valve is leaking. Maximum Allowable Travel 410 Loader Lift cylinder, 191 mm (7.5 in.) / hour 410 Loader Bucket cylinder, 313 mm (12.3 in.) / hour 420 Loader Lift cylinder, 150 mm (5.9 in.) / hour 420 Loader Bucket cylinder, 218 mm (8.6 in.) / hour 430 Loader Lift cylinder, 117 mm (4.6 in.) / hour 430 Loader Bucket cylinder, 219 mm (8.6 in.) / hour 440 Loader Lift cylinder, 150 mm (5.9 in.) / hour 440 Loader Bucket cylinder, 218 mm (8.6 in.) / hour 460 Loader Lift cylinder, 965 mm (3.8 in.) / hour 460 Loader Bucket cylinder, 145 mm (5.7 in.) / hour 47 Backhoe Lift cylinder, 15 mm (0.6 in.) / minute 47 Backhoe Stabilizer cylinder, 8 mm (0.3 in.) / minute 47 Backhoe Stabilizer cylinder (retract rate), 5 mm (0.2 in.) / minute 48 Backhoe Lift cylinder, 10 mm (0.4 in.) / minute 48 Backhoe Stabilizer cylinder, 5 mm (0.2 in.) / minute 48 Backhoe Stabilizer cylinder (retract rate), 5 mm (0.2 in.) / minute

Additional Information When disconnecting the return hose from the cylinder to determine leakage of the cylinder or SCV on a loader, both cylinders' returns are tied together. If leakage is observed from the disconnected cylinder, that cylinder is leaking. If leakage is observed from the hose, the opposite cylinder is leaking.

Affected Equipment

790																																																																	990
4100																																																																	4200
4300																																																																	4400
4500																																																																	4600
4700																																																																	410 Loader
420 Loader																																																																	430 Loader
440 Loader																																																																	47 Backhoe
48 Backhoe