JLG sky trak mmv Service Manual page 251

7.9.1 Transmission Troubleshooting (Continued)
Problem
8. Grinding or "clunking" noise
from transmission.
4. Oil leaking from transmission.
Model MMV Rev. 12/04
Cause
1. Oil level too low.
2. Transmission filled with incorrect
oil.
3. Incorrect clutch engagement.
4. Internal damage.
5. Broken diaphragm (flex plate).
6. Loose diaphragm (flex plate)
mounting capscrews.
1. Oil leaking from vent (high oil
level).
2. Drain plug loose and/or o-rings
damaged or missing.
3. Hose fittings loose.
4. Oil leaking at valve bodies
(possible valve body gaskets
damaged or missing and/or
mounting capscrew not tight).
5. Housing capscrews loose.
6. Oil leaking at pump (possible
pump-to-housing o-rings
missing or damaged and/or
pump mounting capscrews not
tight).
7. Oil leaking at converter bell
(possible converter leak and/or
input shaft seal damage).
8. Oil leaking at output shaft
(output shaft seal damaged).
9. Housing damaged.
Transmission: ZF 4 WG-98 TS
Remedy
1. Fill oil to correct level ( Section
2.13.10, a. Transmission Oil
Level Check ).
2. Drain transmission and fill to
correct level with recommended
oil (refer to Section 2.13.10, b.
Transmission Oil and Filter
Change ).
3. Refer to Section 10.13.8,
Transmission Solenoid Valves .
4. Repair or replace parts and
needed.
5. Replace diaphragm (flex plate),
(refer to Section 7.7.1,
Transmission Removal ).
6. Tighten capscrews.
1. Remove drain plug and drain oil
as needed, until oil is at correct
level (refer to Section 2.13.10, a.
Transmission Oil Level Check ).
Replace o-rings as needed and
tighten plugs to 96 lb/ft
(130 Nm).
2. Replace o-ring as needed and
tighten plug to 26 lb/ft (35 Nm).
3. Tighten fittings.
4. Replace gaskets and/or tighten
capscrews to 7 lb/ft (9,5 Nm).
5. Tighten caps to 34 lb/ft (46 Nm).
6. Replace o-rings and/or tighten
capscrews to 85 lb/ft (115 Nm).
7. Replace converter and/or input
shaft seal.
8. Replace output shaft seal.
9. Replace housing as needed.
7.21