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The hydraulic pump on my 977K (serial # 11K3393) makes a lot of noise when lifting, between a whine and a groan. Changed the barrel filters by the seat. Fluid level is good. It lifts o.k. but the noise seems wrong to me. Is this typical or is there something perhaps wrong and some thing to check... maybe a strainer I don't know about that has become clogged? I don't have a service manual and am at a loss.
Thanks for any help, comments.