1-800-457-5400 Reman drop boxes & differentials for Volvo articulated haulers in stock & ready to ship. For technical help ask for Ken. General Problems Transmission Slippage Unit Will Not Move Transmission System Pressure Is Low (All Gears) Transmission System Pressure Is Low (One or Two Gears) Transmission Shifts Too Slow Transmission Shifts Too Fast Unit “Creeps” in Neutral Transmission Hydraulic System Overheats Excessive Transmission Noise (under load or no load) Unit Vibrates Unit Lacks Power And Acceleration Torque Converter Stall RPM Too High Torque Converter Stall RPM Too Low Transmission Slippage Problem Solution Low oil level Check and add oil Wrong oil grade Check oil grade Weak or broken pressure regulating valve spring Do Transmission System Pressure Test Transmission pump suction screen restricted Remove and clean screen Low transmission pump flow due to worn pump Do Transmission Pump Flow Test Transmission control valve or gasket leakage Remove valve and inspect gaskets Clutch cut-off valve sticking Remove and inspect clutch cut-off valve Restricted modulation orifice housing orifices Remove control valve housing and check for restrictions in valve and valve Excessive transmission element leakage Do Transmission Element Leakage Test Using System Pressure Worn clutch disks Repair transmission Unit Will Not Move Problem Solution Low or no transmission pressure See Transmission Pressure is low (all gears) or Transmission Pressure is low (one or two gears) Service brakes will not release Do Brake Pedal Operational Check. Do Service and Park Brake System Drag Checks Park brake applied or parkswitch misadjusted Adjust park brake switch Stuck control valve spool Check shift linkage operation. Disconnect shift linkage from control valve spool and check linkage movement. Failed torque converter Do Torque Converter Stall Test. If engine pulldown is normal, torque converter is good Broken shafts or gears Drain transmission to determine if large pieces of metal contamination are present Broken drive shafts Inspect drive shafts and universal joints for external damage. Repair Broken ring or pinion gear If drive shafts rotate with transmission in gear but unit does not move, a differential failure is indicated. Repair Transmission Pressure Is Low (All Gears) Problem Solution Low oil level Check transmission oil level and refill if necessary Switch failure Verify transmission system pressure. Do Transmission System Pressure Test Suction strainer is plugged Transmission pump may be noisy if transmission suction screen is clogged. Drain transmission. Remove and clean suction screen. Also, check condition of transmission filter. Transmission pressure regulating valve is stuck or spring is broken Remove transmission pressure regulating valve. Inspect for damage Control valve gasket failure Inspect transmission control valve for external leakage. Remove control valve. Inspect or replace gasket. Transmission pump is failed Do pump flow test Transmission System Pressure Is Low (One or Two Gears) Problem Solution Failed transmission control valve gasket Inspect transmission control valve for external leakage. Remove control valve. Inspect or replace gasket. Clutch piston or seal ring leakage Disassemble and repair Transmission Shifts Too Slow Problem Solution Low oil level (aeration of oil) Check and add oil Low transmission pressure Do Transmission System Pressure Test Transmission pump suction screen restricted Remove and clean screen Low transmission pump flow Do Transmission Pump Flow Test Excessive transmission element leakage Do Transmission Element Leakage Test Using System Pressure Oil passages restricted between control valve and transmission elements emove control valve and inspect oil passages Clutch cut-off valve sticking Remove and inspect cut-off valve Transmission Shifts Too Fast Problem Solution System pressure too high Do Transmission System Pressure Test Stuck modulation valve Remove and inspect modulation valve Stuck or missing forward/reverse check valve Inspect transmission control valve Broken piston return spring Disassemble and inspect clutch Unit “Creeps” in Neutral Problem Solution Warped disks and plates in transmission Check transmission Transmission Hydraulic System Overheats Problem Solution High oil level Check and adjust Low oil level Check and correct Wrong oil grade Check oil grade Park brake on Release park brake Lube lines pinched, restricted, or leaking Check cooler lines Unit operated in too high gear range Operate unit in correct gear range Temperature gauge or sender malfunction Install temperature sensor to verify temperature. Do Tachometer/Temperature Reader Installation Procedure. Air flow through oil cooler or radiator restricted Do Radiator Air Flow Test Oil cooler thermal relief bypass valve stuck Bypass thermal bypass valve and check to see if unit still overheats. Do Transmission Oil Cooler Thermal Bypass Valve Test Oil cooler internally restricted Do Oil Cooler Restriction Test Warped disks and plates in transmission Do Transmission Clutch Drag Check Leakage in transmission hydraulic system Do Converter-Out Pressure Test. Do Transmission Element Leakage Test Low transmission pump output Do Transmission Pump Flow Test Excessive Transmission Noise (under load or no load) Problem Solution Engine slow idle too low Check engine slow idle speed Parts worn or damaged in transmission Remove transmission suction screen. Inspect for metal particles. Repair as necessary Low or no lube Do Converter-Out and Lube Pressure Test. Do Transmission Pump Flow Test Incorrect type of oil Change oil High oil level Drain some oil Low oil level Add oil Air leak on suction side of pump Check oil pickup tube on side of transmission Unit Vibrates Problem Solution Aerated oil Check and add oil Failed universal joints on transmission drive shaft or differential drive shafts Check universal joints Unit Lacks Power And Acceleration Problem Solution Engine fast idle speed set too low Check fast idle adjustment Incorrect transmission oil Check oil Aerated oil Check and add oil Low transmission pressure Do Transmission System Pressure Test. Warped transmission clutch Do Transmission Clutch Drag Checks Brake drag Do Brake Drag Check Clutch cut-off valve sticking Remove and inspect clutch cut-off valve Low engine power Do Engine Power Test Torque Converter Stall RPM Too High Problem Solution Aerated oil Put clear hose on thermal bypass outlet port. Run unit to check for bubbles in oil Converter relief valve stuck open Do Converter-Out Pressure Test Torque converter seal leakage Do Converter-Out Pressure Test Torque converter not transferring power (bent fins, broken stator) Remove and inspect torque converter Torque Converter Stall RPM Too Low Problem Solution Low engine power Do Engine Power Test Mechanical malfunction Remove and inspect torque converter DOWNLOAD CATALOG 1-800-457-5400 Contact Us | Support | Legal | About Us | News | Experts OFFICIAL DEALER PARTS Allison Replacement Parts Funk Replacement Parts Volvo Replacement Parts ZF Replacement Parts Fuji Replacement Parts COMPONENTS Allison Reman Components Funk Reman Components Volvo Reman Components ZF Reman Components Fuji Reman Components TRANSMISSIONS Allison Reman Transmissions Funk Reman Transmissions Volvo Reman Transmissions ZF Reman Transmissions Fuji Reman Transmissions SUBSCRIBE TO OUR NEWSLETTER *The trade name “Volvo®” and the Volvo logo are all property of The Volvo Group. Centranz manufactures parts that are suitable replacements for Volvo equipment. Centranz is not a Volvo dealer. The trade name “John Deere®” and the John Deere logo are all property of Deere & Company. The trade name “Komatsu®” and the Komatsu logo are all property of Kabushiki Kaisha Komatsu Seisakusho Corporation. The trade name “ZF®” and the ZF logo are all property of ZF Friedrichshafen AG. The trade name “Hitachi®” and the Hitachi logo are all property of Hitachi, Ltd. The trade name “Allison®” and the Allison logo are all property of Rolls-Royce Corporation. The trade names listed above are used for descriptive purposes only. ©2021 Centranz, Inc. | All rights reserved. Cookies Policy Free freight one way on all components. *U.S. only. Call for details. close