TM-9-2320-272-24-3
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 3 OF 4
JUNE 1998
TM-9-2320-272-24-3 - Page 708 of 799
TM 9-2320-272-24-3
4-208. TRANSFER CASE POWER TAKEOFF (PTO) MAINTENANCE (Contd)
10.
11.
12.
13.
14.
15.
16.
17.
18.
NOTE
Steps 10 and 11 establish starting shim pack thickness.
Install bearing cap (3) on transfer case PTO (4) and tap alternately around outer edge with soft-
faced hammer.
Using feeler gauge, measure clearance between cap (3) and PTO gear (4). Record measurement.
Remove bearing cap (3) from transfer case PTO (4).
CAUTION
Do not apply sealer on mating surfaces.
NOTE
Use measurement obtained in step 11 plus a .003 in. (0.0762 mm)
shim for starting shim pack thickness.
Install starting shim pack (5) and bearing cap (3) on transfer case PTO (4) with four washers (2)
and screws (1). Tighten screws (1) 18-24 lb-R (24-32 N•m).
Position dial indicator plunger against PTO shaft (6).
NOTE
Steps 15 through 17 check transfer PTO shaft end play.
Force transfer PTO shaft (6) to rear of transfer case PTO (4).
Set dial indicator to zero.
Force transfer PTO shaft (6) to front of transfer case PTO (4) and record reading shown on dial
indicator. End play should be .001-.005 in. (.0254-0.127 mm).
Remove four screws (1), washers (2), and bearing cap (3) from transfer case PTO (4).
CAUTION
Do not apply sealer to mating surfaces.
NOTE
Use reading obtained in step 17 plus a .003 in. (.0762 mm) shim
for starting shim pack thickness.
19.
Install starting shim pack (5) and bearing cap (3) on transfer case PTO (4) with four washers (2) and
screws (1). Tighten screws (1) 18-24 lb-R (24-32 N•m).
20.
Position dial indicator plunger against PTO shaft (6).
NOTE
Steps 21 through 23 check transfer PTO shaft end play.
21.
Force transfer
PTO
shaft (6) to rear of transfer case PTO (4).
22.
Set dial indicator to zero and force transfer PTO shaft (6) to front of transfer case PTO (4).
23.
Record reading shown on dial indicator. End play should be .001-.005 in. (.00254-0.127 mm).
24.
Remove four screws (1), washers (2), and bearing cap (3) from transfer case PTO (4).
NOTE
Use reading obtained in step 23 for number or thickness of shims
to be removed or added for transfer case PTO shaft adjustment.
25.
Remove or add shims (5) as necessary.
26.
Remove shim pack (5).
NOTE
Do not apply sealer to shims.
27.
Apply a light coating of sealer to mating surfaces of transfer case PTO (4) and bearing cap (3).
28.
Install shim pack (5) and bearing cap (3) on transfer case PTO (4) with four washers (2) and
screws (1). Tighten screws (1) 18-24 lb-R (24-32 N•m).
4-972
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