FIGURE 2-4. M977, M984, and M985 Shutdown Solenoid Valve.

TB 9-2320-279-34

NOTE

Steps d. and e. are performed to bypass the crane overload system.

d. Place crane power switch in off position.

e. Place a flat tip screwdriver in slot in front of (M977 and M985 Grove Cranes) or below (M984

Grove Crane) shutdown solenoid to hold shutdown valve closed for steps f., g., and h. (See FIGURE 2-4).

NOTE

Use the manual boom control when performing step g. on the M977

and M985 Grove Cranes. Use the manual hoist control when per-

forming step g. on the Grove M984 Crane.

All test loads should be raised slowly and smoothly.

f. Raise the test load approximately six inches off ground.

g. Hold load stationary. Observe performance of crane structure and note any evidence of possible

failure.

h. Lower load completely. Remove flat tip screwdriver from solenoid valve.

i. Thoroughly inspect crane in accordance with Appendix A of TB43-0142.

NOTE

Crane should not be able to lift load in step j. If crane lifts load, reset

crane overload protection switches (Refer to TM 9-2320-279-34).

j. Connect remote control, set crane power switch to ON position. Attempt to lift test load.

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