. OPERATION DETAILED CONTROLS AND GAUGES OPERATION DETAILED CONTROLS AND GAUGES the operation in Step 5 to engage the lock. 3 - 40 5. Hold the operator' s cab, an d with you r right han d, grip top kno b (D), pull it up, and push it against lo ar o cab securely to lock th e window 6. Check th at lock le ver (B) is securely i n the L OC K position. The lo ck is en gaged if th e arrow o n lock case (F) matches the po If the the ar sition of arrow on row on lo the arrow lock case ck lever ( on lock le (F) does B), the lock ver (B). Check not match the p is not engage