Isuzu Manual (EN)

MYY & MZZ TYPE TRANSMISSION

FOR SERVICE TRAINING MYY & MZZ TYPE TRANSMISSION Applicable Model ISUZU MOTORS LIMITED Model Year Vehicle Model Destination 2003 N*R All

Стр. 1

CONTENTS

CONTENTS Page INTRODUCTION ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- 1 MAIN FEATURES OF MYY & MZZ ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- 2 GEAR RATIO ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- 3 PTO (POWER TAKE OFF) ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- 3 CONSTRUCTION PARTS TRANSMISSION CASE (MYY 5 SPEED) ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- 5 TRANSMISSION CASE (MYY 6 SPEED) ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- 6 TRANSMISSION CASE (MZZ) ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- 7 TOP GEAR SHAFT (MYY & MZZ) --------------------------------------------------------------------------- 8 MAIN-SHAFT (MYY 5 SPEED) --------------------------------------------------------------------------- 9 MAIN-SHAFT (MYY 6 SPEED) --------------------------------------------------------------------------- 10 MAIN-SHAFT (MZZ) -------------------------------------------------------------------------------- 11 COUNTER-SHAFT (MYY 5 SPEED) ---------------------------------------------------------------------- 12 COUNTER-SHAFT (MYY 6 SPEED & MZZ) ------------------------------------------------------------ 12 CONTROL BOX ------------------------------------------------------------------------------------- 14 GEAR SELECT & SHIFT CONTROL ---------------------------------------------------------------------- 15 INDEX-BALL TYPE SYNCHRONIZER ---------------------------------------------------------------------- 16 DETENT ASSEMBLY ------------------------------------------------------------------------------------- 17 SPEED METER GEAR ------------------------------------------------------------------------------------- 17 SECTION VIEW (MYY 5 SPEED) --------------------------------------------------------------------------- 18 SECTION VIEW (MYY 6 SPEED) --------------------------------------------------------------------------- 19 SECTION VIEW (MZZ) ------------------------------------------------------------------------------------- 20 SERVICING OIL LEVEL CHECK ------------------------------------------------------------------------------------- 21 PROBLEM & INSPECTION -------------------------------------------------------------------------------- 22 MEASUREMENT ITEM ------------------------------------------------------------------------------------- 23 SPECIAL TOOLS ------------------------------------------------------------------------------------- 26

Стр. 2

INTRODUCTION

MYY & MZZ Transmission-1 INTRODUCTION 1 2 3 1. MYY 5 Speed 2. MYY 6 Speed 3. MZZ 6 Speed The 2003 model year vehicle with manual transmission model, MYY & MZZ type transmission has newly adopted instead of MXA & MBP type. By reason of construction change, transmission weight is reduced and allowable maximum input torque is upped. The MYY type has mainly employed to 4J series engine which is mounted NHR, NKR or some NPR tracks. And, it has also employed to 4H series engine with low output which is mounted NKR or NPR trucks. The MZZ type has mainly employed to 4H series engine with high output which is mounted NPR or NQR tracks.

Both type of transmission has very similar features, and construction & operation are nearly same. So that, the service procedures such as overhaul repair will be understood by disassembly either MYY or MZZ .

Стр. 3

MAIN FEATURES OF MYY & MZZ

MYY & MZZ Transmission-2 MAIN FEATURES OF MYY & MZZ 1 6, 7 4 MYY 5 11 12 6, 7 1 4 MZZ 5 11 12 Transmission Case: 1. Tube type three pieces transmission case made by cast aluminum alloy. 2. Fine pitch fixing bolts are applied for transmission case fixing. 3. Liquid type gasket is applied for sealing. Gear, Bearing & Synchronizer: 4. Roller bearings are adopted to support the both ends of the main-shaft. 5. Tapered roller bearings are adopted to support the both ends of the counter-shaft. 6. Common boss size at 1st, 2nd, 3rd and reverse main gear. 7. Common needle bearings are adopted at 1st, 2nd, 3rd and reverse main gear. 8. Sintered clutch hubs are adopted for all gears. 9.

Common sleeves & hubs are adopted at 1st-reverse and 2nd-3rd. 10. Common sleeves are adopted at 4th-5th and 6th. 11. Index-ball type triple cone synchronizer is adopted at 1st and 2nd-3rd. 12. Index-ball type single cone synchronizer is adopted at reverse. Shift Control: 13. Twin-rod type shift control is adopted. 14. Cast aluminum alloy shift arms are adopted at 1st-reverse, 2nd-3rd and 4th-5th.

Стр. 4