HYDRAULIC IMPACTOR DOES NOT WORK

TM 5-2420-222-20-1

ORGANIZATIONAL TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

25. HYDRAULIC IMPACTOR DOES NOT WORK

Step 1.

Check hydraulic impactor oil lines (1 thru 7) for sharp bends, dents, and kinks.

a. If hydraulic impactor oil lines (1 thru 7) are not bent, dented, or kinked, go to step 2.

b. If hydraulic impactor flow regulator-to-boom oil lines (1) has sharp bend, dent, or kink, replace

(Serial Numbers 235786 thru 235999, page 2-1499; Serial Numbers 319995 thru 342573, page

2-1505).

c. If jaw direct linear valve-to-hydraulic impactor valve oil line (2) on loader backhoes with Serial

Numbers 319995 thru 342573 has sharp bend, dent, or kink, replace (page 2-1421).

d. If manifold-to-hydraulic impactor valve oil line (3) on loader backhoes with Serial Numbers

235786 thru 235999 has sharp bend dent, or kink, replace (page 2-1444).

e. If boom-to-manifold hydraulic impactor return oil line (4) on loader backhoes with Serial Numbers

235786 thru 235999 has sharp bend, dent, or kink, replace (2-1483).

f. If boom-to-backhoe control valve hydraulic impactor return oil line (5) on loader backhoes with

Serial Numbers 319995 thru 342573 has sharp bend, dent, or kink, replace (page 1489).

g. If quick coupler-to-boom oil line (6 or 7) has sharp bend, dent, or kink, replace (Serial Numbers

235786 thru 235999, page 2-1472; Serial Numbers 319995 thru 342573, page 2-1477).

Step 2.

Remove hydraulic impactor flow regulator (8) (page 2-1237). Connect hydraulic system test set to

hydraulic impactor flow regulator. Using hydraulic system test set, apply 1800 psi (12,411 kPa) and

note reading on flow meter. Flow meter should read 25 gallons per minute (95 liters per minute).

Disconnect hydraulic system test set from hydraulic impactor flow regulator.

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