35 - 1
Section F Transmission
9803/3280
Section F
35 - 1
Issue 1
Fault Finding
Synchro Shuttle Gearbox
Before carrying out the checks listed the machine should, if possible, be operated to determine the fault area(s), and bring the
systems to their normal working temperatures.
Ensure that the correct quantity and grade of oil is used and that there are no obvious leaks.
A If the transmission is noisy, start at check 1.
B If the transmission is overheating, start at check 4.
C If the transmission will not pull, start at check 12.
D If there is no drive in one or both directions, start at check 17.
E If the transmission is jumping out of gear, start at check 29.
F If the transmission is sticking in gear, start at check 39.
G If ratios are 'crash changing', start at check 41.
CHECK ACTION
1 Is there noise when selecting direction? YES: Check 3
NO: Check 2
2 Is there noise when running with direction selector YES: Check 9
in neutral and ratio selector in 1st? NO: Check 19
3 Is there air in the hydraulic system? YES: Continue running to expel air.
NO: Check 4
4 Is the fluid level correct? YES: Check 5
NO: Check level only when machine is cold and top-up as
required.
5 Are the oil passages restricted? YES: Clear the restriction.
NO: Check 6
6 Is the suction strainer restricted? YES: Remove and clean strainer.
NO: Check 7
7 Is pump pressure as specified? YES: Check 9
NO: Check clutch pressure maintenance valve is free to
operate.
8 When flow testing pump, is output low? YES: Renew pump.
NO: Check converter sprag clutch for wear or slip.
9 Does the noise continue when direction selector YES: Check 10
is in forward or reverse? NO: Check 11
10 Is transmission misaligned? YES: Renew mountings and check position.
NO: Check 'converter out' pressure and flow.
11 Are the pump bushes worn? YES: Renew
NO: Check converter for wear or cooler for restriction to
flow.
12 Is the transmission not pulling in one direction only? YES: Check 16
NO: Check 13
13 Is the transmission not pulling in both YES: Stall test machine, Check 14.
Forward and Reverse? NO: Check 16
To Next Page
Need help?
General
