NC SW6 - Page 77

77
Fault Finding
CHART E1—Dumper gearbox (continued)
Check Action
9
Does the noise continue when the direction selector is in forward
or reverse?
YES: Check 10
NO: Check 11
10
Is the transmission misaligned? YES: Renew mountings and check
position.
NO: Check “converter out” pressure
and flow.
11
Are the pump brushes worn? YES: Renew
NO: Check converter for wear &
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 forward & reverse? YES: Stall test machine & Check 14.
NO Check 16
14
Is converter pressure as specified? YES: Check 15
NO: Inspect converter relief valve for
damage . Check cooler bypass
valve pressure setting.
15
Is pump being driven by converter? YES: Check pump pressure.
NO: Renew damaged parts.
23
Is the noise present when in neutral or when in gear NEUTRAL: Check 24
IN GEAR: Check 27
16
Are clutch sealing rings damaged? YES: Tap pressure gauge into clutch
feed lines to monitor pressure.
NO: Check clutch plates for damage.
17
Is there drive in one direction only? YES: Check 19
NO: Check 18
18
Is the start switch in the run position and supplying current to the
neutral start relay?
YES: Check 19
NO: Rectify
19
Is the fault only when the transmission is hot? YES: Dismantle solenoid and check
components.
NO: Check micro-switches, relays
and wiring loom.
20
Is the noise a growl, hum or grinding? YES: Check gears for damage/wear.
NO: Check 21
21
Is the noise a hiss, thump or bumping? YES: Check bearings for damage/wear
NO: Check 22
22
Is the noise a squeal? YES: Check free running gears for
seizure.
NO: Check 23