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Shaft seal on hydraulic motor forced off its seat.
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Return pressure too high. Pressure and return lines inadvertently interchanged.
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Max. return line pressure is 1500 kPa (15 bar; 217 psi); clean the couplers and connect correctly.
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Return pressure too high.
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Unfavourably routed oil return line; cross-section too small.
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Re-route return line in tractor; use larger diameter lines and couplers.
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Oil leaking from hydraulic motor.
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Shaft seal either worn or fitted wrong way.
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Install new shaft seal.
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Insufficient speed.
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Incorrect setting of three-way flow control valve; tractor not supplying sufficient oil or not generating required pressure.
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Check the three-way flow control valve; check the hydraulic pump; check the pressure-relief valve.
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Hydraulic motor cuts out for short periods at a time.
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Unfavourably routed oil return line; insufficient oil in reservoir; oil returning via SCV.
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Select a different connecting point for the zero-pressure return line; larger oil reservoir.
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Pressure peaks in pressure line.
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Drive output of pneumatic system too high.
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Connect up all hose lines belonging to the pneumatic system of the drill.
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Valve lever jumps out of its engaged position.
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Pressure peaks in pressure line; cut-off pressure too low; pressure in pressure line too high.
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Check setting; use pipes.
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Hydraulic oil overheating.
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High delivery rate.
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Install additional oil cooler.
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Delivery rate too high (in the case of closed-center hydraulic system)
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Remedy the problem by means of variable displacement pump; install or convert three-way flow control valve.
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