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My husband's fitted a forklift to the rear of our 6711. We had all the hoses renewed beforehand. When we first tried to lift something it was fine for the first couple of times. Now it won't lift at all. We're assuming the hydraulic fluid level is low...does that sound right? If so, how / where do we drain the hydraulic system and how / where do we top it up? And is it right that the system can be overfilled? How do you know what the correct level is? If this isn't the answer, what else could be wrong?