APRIL 2012
Contents
1. Reduction 7 fr TNE te Park Brake bushings and Cylinder detent assembly Circlip and washer Support Broken reduction bushing z Figure 3 The pivot on the support seized and the pressure from the park brake cylinder pushed the circlip off the brake actuator rod and cracked the reduction bushing This broke the connection to the park brake lever resulting in no parking brakes It is very important to lubricate all of the grease points on your equipment regularly and properly to avoid costly damage and equipment downtime For more information regarding this axle or any other component repair or maintenance please consult the correct service manual for the serial number of the unit you are working on If you have any questions regarding your Skyjack product please call Skyjack Product Support at 01691676236 or e mail info skyjackeurope co uk TECH TIDBIT f d f f f When maintaining or troubleshooting a liquid propane L P system check the hose to tank coupling for dirt or debris in the end Also check the tank fitting and the hose coupling for the tank O ring When removing an empty tank the O ring can get stuck in the hose coupling and prevent the coupling from threading fully onto the new tank s fitting The coupling looks completely attached but the extra O ring will not allow the valve to extend far enough into the tank fitting It will not leak but no L P will flow into the hose 2 SKYJACK2. SKYJACK Skyjack Technical Service U K Unit 1 Maes Y Clawdd Maesbury Road Industrial Estate Oswestry Shropshire SY10 8NN United Kingdom Phone 0044 1691 676 235 z N Fax 0044 1691 676 238 P a gt www skyjack com email infoldskyjackeurope co uk Tech Tips The Skyjack boomlift models 40 45T 61 66T 46 51A and telehandler models VR642 VR843 ZB6042 and ZB8044 use drive axles with spring applied hydraulically released parking brakes The parking brakes are actuated by a cylinder and dual lever mechanism on the top of the axle housing Figures 1 amp 2 Park Brake Cylinder Rod end Quick release mechanism Support Park Brake Lever arm with grease fitting Park Brake Cylinder Barrel End Park Brake Lever arm with grease fitting Figure The park brakes are released when hydraulic pressure is applied to the brake cylinder and the cylinder extends pushing the brake levers apart When hydraulic pressure is released a Spring inside the brake cylinder retracts the rod pulling the brake levers toward each other applying the park brake SKYJACK Tech Tips The park brake lever is equipped with a grease fitting and if not properly and regularly lubricated the lever can bind up on the support pivot breaking apart the quick release mechanism causing the park brake to stay released Figure 3 shows the park brake cylinder quick release mechanism damaged because of a seized brake lever support pivot
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