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As good as the Allied winch is, the day will come when the winch needs some service attention. Sometimes, the problem is obvious. But there are times when the winch has lost vital functions and the cause is not readily apparent. A quick check of operating pressures can help rule out certain problems or target others right away.
Hydraulic pressure is required to apply the clutch to engage the drum. It also releases the brake so that the drum can turn. Low pressure in either system indicates problems.
The exact details of the procedure for checking pressures are found on the Service Manual, Section 3. But the basic idea is to attach pressure gauges at three different points in the winch and observe system pressures while the winch is operating. This is possible only while the winch is still attached to the tractor.
On the W3C winch, there are two external test ports, marked BK (for brake) and CL (for clutch). A third gauge is attached to the accumulator.
On the other Allied winches, the three pressure test ports are on the hydraulic control valve, located inside the winch. Access to the control valve is through an access cover located on the right side on W5C winch, and on the left side for W6F, W8L and W12E winches.
Follow the procedures marked in Section 3 of your Service Manual. With this information, you should be able to diagnose most problems related to the hydraulic system. But don't hesitate to call Allied if things don't make sense.
Winch system hydraulic pressure can be as high as 300 psi (2000 kPa). Use caution when servicing any hydraulic system.
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