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TM 10-3990-203-13&P
SECTION II
PREPARATION FOR USE
and tighten it by hand. Using a 7/16 inch box wrench,
2. UNATTACHED PARTS
tighten the plug securely.
2.1 Special, minor assemblies shall be completed
NOTE
before the ramp is considered completely assembled
and ready for use.  The parts for these assemblies
Hydraulic fluid level should be at the bottom
are shipped in the attached parts box (para. 1.5.1).
of plug opening.  Fluid should be added with
Table 2-1 lists the parts in the box.
the ramp in the lower position using hydrau-
lic fluid, Military Specification MIL-H-5606C,
2.2 SHIPPING PLUG
2.2.1 To maintain proper oil level in the hydraulic
2.3 SAFETY CHAIN ASSEMBLY
system during shipping, a temporary shipping plug
2.3.1 There are two safety chain assemblies (Table
has been inserted at the top of the hydraulic pump
2-1), one for each side of the service end of the ramp
reservoir (Fig. 2-1).  This plug shall be removed
(Fig. 2-2).  The chains have hooks on one end and
and replaced with a breather plug (Table 2-l).
are attached to mounting plates with shackles on the
opposite ends (Fig. 2-3).
2.2.2 To change the plug, approach the pump through
the pump access port on the left side of the ramp
2.3.2 Take one safety chain assembly from the
(Fig. l-l).  Using a 7/16 inch box wrench, loosen
special parts box (Table 2-1). The chains shall be
and remove the shipping plug (Fig. 2-1).
attached to the ramp by bolting the mounting plate to
NOTE
the frame bracket (Fig. 2.-3).
2.3.3 Line up the holes in the mounting plate with
Store the shipping plug, do not discard it.
the holes in the frame bracket. The chain shall be
Reshipment of the ramp will require changing
the plug again.
towards the service end of the ramp. From the out-
side of the mounting plate insert a 1/2-13 x 1 1/4 hex
head capscrew (Table 2-1) through the top hole (Fig.
2-3). From the backside of the frame bracket, thread
one of the 1/2-13 locknuts onto the end of the cap-
Do not overtighten the breather plug causing
screw and tighten by hand.  Repeat the fastening
procedure for the bottom hole.  Using a 3/4 inch
the threads to strip.
box wrench on the locknuts and a 3/4 inch socket
2.2.3 Take the breather plug from the special parts
and ratchet, tighten the fasteners securely. Attach
box (Table 2-l).  Insert the breather plug into the
the second safety chain assembly to the opposite side
threaded hole where the shipping plug was removed
of the ramp by repeating the entire procedure.
Table 2-1. Parts Box - Contents
PART NUMBER
NOMENCLATURE
QUANTITY
Safety Chain Assembly Consisting Of:
310804
2
Eye Grab Hook
83026
1 per Assy
1/4" Connecting Link
83027
1 per Assy
1/4" x 8' Chain
83030
1 per Assy
1/4" Shackle with Pin
83029
1 per Assy
Mounting Plate
310806
1 per Assy
Mounting Bolts
80048
2 per Assy
80606
Hex Locknuts
2 per Assy
Breather Plug - Hydraulic Pump
55550
1
Manual
310999
2
2-1

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