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Boom & AttachmentsXR620/621/842/1045/1245/1254/1267/1534/2050/3034RETRACT BOOM1. Remove four screws and washers from boom access panel (Figure 10-13, Sheet 1).2. Remove boom access panel.3. Loosen locknut on extend cylinder manual lowering valve (Figure 10-13, Sheet 2).4. Turn extend cylinder manual lowering valve adjustment screw counter-clockwise (CCW) until boomstarts to retract. Continue turning adjustment screw until a safe retraction speed is achieved.Failure to turn the manual lowering valve adjustment screw clockwise andtightening the locknut may cause the boom to bleed out.5. After boom has retracted, turn extend cylinder manual lowering valve adjustment screw fully clockwise(CW) and tighten locknut.6. Attach boom access panel to boom with four screws and washers.LOWER BOOMA possible left or right cylinder failure may cause the boom to lower unexpectedlywhen the manual lowering valve adjustment screw is turned fully counterclockwise.1. Turn manual lowering valve adjustment screw on left boom lift cylinder fully counterclockwise(approximately five turns).2. Turn the manual lowering valve adjustment screw on right boom lift cylinder counterclockwise untilboom starts to lower. The speed at which boom lowers can be controlled by turning adjustment screwclockwise or counterclockwise.3. After boom has been lowered, close left and right manual lowering valves by turning adjustmentscrews in fully clockwise. (With valves closed, boom will operate normally when original hydraulicsystem or engine malfunction has been repaired.)Service Manual Rev 01 – 05/10 10-30P/N 24933-000