Page 858 - Workshop Manual - Aumark (BJ1051)

31A-12
Transmission (646b/651b)-transmission assembly

Malfunction symptom table
Use the table below to help you find the cause of the malfunction. The numbers indicate the probability of the cause of
malfunction. Check each part in order. If necessary, replace these parts.

Symptom Suspect Area Reference

1. Lubricating oil (The viscosity is -
too low)
2. Lubricating oil (Not enough) -

Chapter 31 a transmission
3. Bearing (Worn or damaged) (646b/651b)-transmission assembly,
overhaul

4. Gear shift fork and synchronizer Chapter 31 a transmission
gear (The combination is not (646b/651b)-secondary-axle
The abnormal sound or noise is too appropriate) assembly, overhaul
big.
5. Synchronizer (Worn or Chapter 31 a transmission
damaged) (646b/651b)- secondary -axle
assembly, overhaul
Chapter 31 a transmission
6. Gear tooth (Scratched or worn) (646b/651b)-transmission assembly,
overhaul
Chapter 31 a transmission
7. Transmission housing (Distorted (646b/651b)-transmission assembly,
and deformed)
replacement
1. Lubricating oil (The viscosity is -
too big)

2. Clutch (The separation is not Chapter 32 clutch-clutch assembly
complete) part, overhaul

Chapter 31 a transmission
3. Bearing (Worn or damaged) (646b/651b)-transmission assembly,
overhaul
31A Chapter 31 a transmission
4. Synchronizer (Damaged) (646b/651b)- secondary-axle
assembly, overhaul
It is difficult to engage a gear for the
transmission. Chapter 31 a transmission
5. Shift fork catch bolt (Loose) (646b/651b)-upper cover assembly,
overhaul
Chapter 31 a transmission
6. Gear shift fork (Deformed or (646b/651b)-upper cover assembly,
damaged)
overhaul
Chapter 31 a transmission
7. Fork shaft (Deformed or (646b/651b)-upper cover assembly,
damaged)
overhaul
Chapter 31 a transmission
8. Lock steel ball (Worn seriously) (646b/651b)-upper cover assembly,
overhaul

Page 858