TM 9-2320-260-34-2
15-51. LIFTGATE PLATFORM AND HINGE PLATE MAINTENANCE (M820A2) (Contd)
b. Cleaning and Inspection
1. For general cleaning instructions, refer to para. 2-8.
2. For general inspection instructions, refer to para. 2-9.
1. Straighten and aline platform (9), two platform supports (17), connecting links (21), four radius
rods (18), hinge plate (1), and two hinge leaves (2) (TM 9-237).
2. Weld platform (9), two platform journals (16), platform supports (17), connecting links (21), four radius
rods (18), hinge plate (1), and two hinge leaves (2) if cracked or weld seams are split (TM 9-237).
1. Using outside micrometer, measure outer diameter of two platform journals (16) and note
measurements separately.
2. Install shims (10) and two bearing caps (11) on bearing arms (7) with eight screws (12) and
nuts (14). Tighten nuts (6) 75-85 lb-ft (102-115 Nm).
3. Using inside micrometer, measure inner diameter of bearing surface between bearing arms (7)
and bearing caps (11). Note measurements separately.
NOTE
Clearance between platform journals and bearing surfaces must be
0.010-0.015 in. (0.25 mm-0.38 mm).
4. Subtract measurement from step 3 from measurement from step 1 to obtain journal clearance.
NOTE
Tag shims for installation.
5. Remove eight nuts (14), screws (12), shims (10), and two bearing caps (11) from bearing arms (7).
6. If clearance is not within limits, add or remove shims (10) by performing steps 2 through 5 until
journal clearance is within limits.
1. Install two lubrication fittings (8) on bearing arms (7).
WARNING
Platform is heavy and bulky; handle with care. Failure to do so
may result in injury to personnel or damage to equipment.
NOTE
Four assistants will help with steps 2 and 3.
q
Coat all bearing surfaces with lubricating oil during installation.
q
2. Install platform (9) on two bearing arms (7) and position support under platform outer edge.
3. Install shims (10) and two bearing caps (11) on bearing arms (7) and platform journals (16) with
eight screws (12), new Iockwashers (13), and nuts (14). Tighten nuts (14) 75-85 lb-ft (102-115 Nm).
4. Install eight lubrication fittings (19) on four radius pins (18) and radius rods (20).
5. Install four radius rods (20) on two platform supports (17) and clutches (22) with four radius
pins (18), two connecting links (21), and eight new cotter pins (15).
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