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Boom & AttachmentsXR620/621/842/1045/1245/1254/1267/1534/2050/3034(1) Fork Blade and Shank. The fork blade and shank shall be thoroughly checkedfor wear, special attention being paid to the vicinity of the heel. If the thickness isreduced to 90% of the original thickness, the fork shall not be returned to service.(2) Fork Hooks (Where Originally Provided). The support face of the top hook andthe retaining faces of both hooks shall be checked for wear, crushing, and otherlocal deformations. If these are apparent to such an extent that the clearancebetween the fork and the fork carrier becomes excessive, the fork shall not bereturned to service until repaired in accordance with Para. 6.2.8.2.(g) Legibility of Marking (When Originally Provided). If the fork marking inaccordance with Para. 7.25.2 is not clearly legible, it shall be renewed. Markingshall be renewed per instructions from original supplier.6.2.8.2 REPAIR AND TESTING(a) Repair. Only the manufacturer of the fork or an expert of equal competence shalldecide if a fork may be repaired for continual use, and the repairs shall only becarried out by such parties. It is not recommended that surface cracks or wear berepaired by welding. When repairs necessitating resetting are required, the fork shallsubsequently be subjected to an appropriate heat treatment, as necessary.10-14 MANUALLY RETRACT AND LOWER BOOMA hydraulic system or engine malfunction may make retracting and lowering the boom impossible. In thissituation, the boom can be retracted and lowered by opening manual lowering valves located on theextend cylinder valve block and the left and right boom lift cylinder valve blocks (Figure 10-13). Note thatthe boom must be above horizontal to accomplish retraction and lowering. Gravity supplies the powerrequired to retract and lower the boom.Perform the following procedure to manually retract and lower the boom:– TASK REQUIREMENTS –PersonnelOne mechanicSpecial tools and equipmentSafety glassesParts and consumable materials Danger tags (2)DO NOT get under a raised boom unless the boom is blocked up.Service Manual Rev 01 – 05/10 10-29P/N 24933-000