INNER BOOM LIFT CYLINDER DRIFTS. cont'd -680640444

5-2420-224-20-1

Table 3-5. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

CRANE (HMMH) (CONT)

NOTE

Step c is for passenger side inner boom lift cylinder.

Step d is for driver side inner boom lift cylinder.

Use threaded plugs in hoses in steps c, d, h, and i. Failure to do so will result in

spilled hydraulic oil.

Remove lower hose (3) from passenger side inner boom lift cylinder (1)

and install threaded plug in hose.

d. Remove upper hose (4) from driver side inner boom lift cylinder (2) and

install threaded plug in hose.

e. Start engine. Move control lever to extend inner boom lift cylinders

(1 and 2) and check for oil leak from fittings (5).

If there is leakage from fittings, replace inner boom lift cylinder

(page 4-692).

If there is no leakage from fittings, stop engine and go to

step f.

Remove threaded plugs from hoses (3 and 4) and install hose on inner

boom lift cylinders (1 and 2).

g. Start engine, retract inner boom lift cylinder completely, and stop engine.

NOTE

Step h is for passenger side inner boom lift cylinder.

Step i is for driver side inner boom lift cylinder.

h. Remove upper hose (6) from passenger side inner boom lift cylinder (1)

and install threaded plug.

Remove lower hose (7) from driver side inner boom lift cylinder (2) and

install threaded plug.

Start engine. Retract inner boom lift cylinders (1 and 2) and check for

oil leak from fittings (8).

If there is leakage from fittings, replace inner boom lift cylinder

(page 4-692).

If there is no leakage from fittings, go to step 2.

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