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Figure 2-I. Hydraulic Jack Operation and Erection Diagram (Sheet 1 of 2).
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TM-55-1730-208-13 Jack Hydraulic Part Number 50J25178 (TYPE B6) Manual
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Section II. OPERATION UNDER UNUSUAL CONDITIONS
TM 55-1730-208-13
WARNING
Clear area beneath aircraft of all
equipment and personnel before
lowering aircraft.
(1) Loosen retainer screw on ram lock nut
assembly and turn ram lock nut assembly to the top of
extension screw of ram assembly.  Tighten retainer
screw.
(2) Open air vent assembly and slowly open
release assembly located on pump assembly until
desired lowering rate is obtained.
CAUTION
Lowering rate of the hydraulic
jack is controlled by the release
assembly.
Do not open the
release assembly too quickly.
(3) When  ram  assembly  is  completely
lowered, close vent and release assemblies.
(4) Turn extension screw in until it is lowered
inside the ram.
AV 010004
Figure 2-1. Hydraulic Jack Operation and Erection
2-8. Operational Inspections.
Diagram (Sheet 2 of 2).
Refer to table 2-1 for inspection criteria pertinent
to the hydraulic jack operator.
2-9. Servicing.
Refer to chapter 3, paragraph 3-6 for servicing
information.
Table 2-1. Operator's Daily Preventive Maintenance
BEFORE OPERATION PROCEDURES
Inspect hydraulic jack for condition of paint, corrosion, and bent braces.
Inspect all bolted connections for damage and security.
Inspect extension screw and ram for dirt and corrosion and ram lock nut assemble, free rotation. Clean and
lubricate as necessary.
Inspect hose for deterioration, kinks, and leaks.
Inspect pump piston for dirt, corrosion, and leaks.
Check hydraulic fluid level in reservoir.
Check ram operation.
DURING OPERATION PROCEDURES
Check for evidence of leaks at pump assembly, hose, and cylinder and ram assembly.
AFTER OPERATION PROCEDURES
Check hose for leaks. Tighten if necessary.
Check hydraulic fluid level in reservoir.
Clean hydraulic jack.
Record all deficiencies on DA Form 2404 and corrective action taken.
2-3

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