Lull 944E-42 Service Manual - Manual (Page 101)

3.53 Model 644E-42/944E-42 Rev. 6/04
Boom
4. Boom will not raise or lower. 1. Broken hydraulic hoses or tubes
and/or connection leaks.
2. Lift/Lower hydraulic system(s)
not operating properly.
3. Faulty Lift/Lower cylinder.
4. Seized boom pivot pin bearing.
1. Locate break, replace hose(s)
or tube(s), tighten connections.
2. Refer to Section 8.7, “Hydraulic
System Testing,” and/or
Section 8, “Hydraulic System”
pages 8.82, 8.84, 8.86 or 8.88
3. Replace cylinder. (Refer to
Section 3.3.1, a. “Inner Boom
Removal,” Steps 1-20 for
information on removing the
Extend/Retract cylinder.)
4. Replace bearing.
5. Boom shifts to right or left
when extending.
1. Boom pivot pin improperly
shimmed.
2. Incorrect wear pad gap or
shimming, or wear pads
excessively worn.
1. Re-shim the boom to a
maximum total gap of 0.09" (2,3
mm) with shims distributed
evenly on both sides of the
boom pivot pin. (Refer to
Section 3.3.3, “Outer Boom
Replacement.”)
2. Shim wear pads to correct gap.
Replace wear pads as needed.
(Refer to Section 3.5.1, “Boom
Wear Pad Replacement.”)
6. Boom pivot pin noise and/or
wear.
1. Worn bearing(s). 1. Replace bearing(s) and worn
pins as needed.
7. Slave cylinder pivot pin noise
and/or wear.
1. Insufficient lubrication.
2. Worn bearing(s).
1. Lubricate at regular intervals.
(Refer to the appropriate
Operators Manual for lubrication
information.) Replace worn pins
as needed.
2. Replace bearing(s) and
lubricate at regular intervals.
(Refer to the appropriate
Operators Manual for lubrication
information.)
Boom Troubleshooting (Continued)
Problem Cause Remedy