PDF Technical Manual War Department Ordnance Engine RD 1820 (Caterpillar) - 2 MB
This is a digital copy of the original War Department Technical Manual 9-1756A for the Ordnance Engine RD 1820, manufactured by Caterpillar.
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--- Page 1 ---
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TiviS-
1756A
WAR DEPARTMENT TECHNICAL MANUAL
Di. . ••.AS'S
Auth : HMD 77512$ V
By NMHP MAiRfi
MAINTENANCE
Ordnance Engine
Model RD-1820 (Caterpillar)
This recsi-tl was previously
'allocated to RC- 319 (Entry
No. 382) and is now assigned
to EG 287.
WAR DEPARTMENT 9 DECEMBER 1943
FOR ORDNANCE PERSONNEL ONLY
--- Page 3 ---
2
g SO
CRANKCASE VENTILATOR S *i.
£ ^
r> Ul
AIR HEATER
AIR INTAKE ElBOWS —
EXHAUST MANIFOLD
i
.OVERNOR
WIRING HARNESS •ACCESSORY DRIVE
SUPERCHARGER HOUSING REVOLUTION COUNTER
OIL PUMP : UEl TRANSFER PUMP
REAR ENGINE SUPPORT
JUNCTION BLOCK
AIR DEFLECTORS
OIL DRAIN CONTROL RA PD 311003
Figure 2 — Rear View of Engine
--- Page 4 ---
TM 9-1756A
6
ORDNANCE MAINTENANCE - ORDNANCE ENGINE MODEL RD-1820 (CATERPILLAR)
RA PO 3I1O11
Figure 13 — Removing Precombusfion Chamber, Using Wrench 5A1937
1
Figure 14 — Removing Intake Pipe
o. Remove Crankshaft (fig. 20). Install lifting eye (5A2265)
over threads at end of crankshaft, and lift crankshaft and connecting
rod assembly out of crankcase main rear section.
p. Remove Supercharger (fig. 21). Rotate engine stand so that
supercharger is in the upward position. Remove nuts securing super
charger rear housing to supercharger front housing. Install lifting eye
(5A2207) to supercharger rear cover and lift supercharger from en
gine. CAUTION: Insure that supercharger is lifted straight off to avoid
damage of seal rings. Remove supercharger front housing and crank-
case rear main section by removing bolts that secure front super
charger housing to rear engine support.
20
--- Page 5 ---
TM 9-1756A
8-9
ORDNANCE MAINTENANCE - ORDNANCE ENGINE MODEL RD-1820 (CATERPILLAR)
A-CLUTCH RELEASE
SHOE
B-CLUTCH RELEASE
YOKE
C—YOKE SPRING
D-NEEOLE BEARINGS
E-OIL SEALS
F—RELEASE ARM
PINS
G—CLUTCH RELEASE
ARM
H—LINKS
I—LINK PINS
J- RELEASE ARM
PIN
K-CLUTCH RELEASE
LEVER
RA PD 311O52
Figure 26 — Clutch Control Disassembled
(3) INSTALL OIL LINES. Install gasket and oil suction tube as
sembly from base of transfer case to inlet of oil pump. Tighten cap
screws and lock wire. Install gasket and oil outlet assembly at outlet
of transfer case oil pump with nipple pointing towards left viewed
from cover side of transfer case. Secure in place with cap screws and
lock wire. Install gasket and oil distributing pipe assembly in open
ing in transfer case cover above oil pump. Install gasket and oil inlet
assembly over distributing pipe. Position oil inlet assembly with nipple
pointing towards the right. Secure in place with cap screws and lock
wire. Screw breather adapter into top of transfer case and install
gasket and breather tube pipe assembly, securing in place with cap
screws and lock wire.
9. CLUTCH CONTROL AND OIL COOLER.
a. Oil Cooler (fig. 1).
(1) DISASSEMBLY. Disconnect oil outlet pipe from cooler. Re
move cap screws holding oil cooler to transfer case support and lift out
oil cooler. CAUTION: Handle carefully and do not twist cooler.
(2) CLEANING. Refer to paragraph 5 a.
(3) INSPECTION. Inspect oil cooler for cracked, broken or dam
aged tubes. Inspect bypass tubes for mutilations causing possible re
strictions. Test cooler by filling with oil and applying 200 pounds air
pressure.
30
--- Page 6 ---
TM 9-1756A
13-14
ORDNANCE MAINTENANCE - ORDNANCE ENGINE MODEL RD-1820 (CATERPILLAR)
(f) Valve Guides. If valve guides do not require replacement,
clean bores with crocus cloth and suitable lubricant. To replace valve
guides, drill out old guide so that a thin shell remains in cylinder head.
Break out this shell, being careful not to damage bore of cylinder head.
If bore of cylinder head has not been damaged, a standard valve guide
may be installed. If oversize guide must be used, ream to obtain proper
fit between valve guide and cylinder head. Press in new guide after
heating cylinder assembly to 300°F. for one hour. Valve guide flange
must bottom within 0.001 inches of head. Ream newly installed valves
to obtain proper fit, with valve stems (Refer to par. 22). Clean bores
with crocus cloth. Reface valve seats after installation of new guides.
(g) Valves. Stone burs or nicks from valve spring washers and
from retainer locks. Reface pitted or warped valve faces, removing
no more metal than is necessary to true up face. Remove carbon and
discoloration by polishing with crocus cloth and gasoline. Do not at
tempt to remove more than 0.005 inch of metal from diameter of
exhaust valve. Grind faces of exhaust valves to an angle of 43° 30'
to 43° 45'. If a valve does not seat properly upon testing, it is permis
sible to lightly lap valve and seat.
(5) ASSEMBLY. Lubricate valve stems with engine oil. Place both
valves in cylinder. Install lower valve spring washers around each
valve guide. Place inner, intermediate, and outer valve springs, in place
on lower washers and the upper valve spring retainer washer on top
of springs. Compress valve springs, using valve spring compressor
(5A2286) and install valve locks (fig. 32).
14. CRANKCASE FRONT SECTION,
a. Disassembly (fig.17).
(1) FUEL PUMP CAM. Remove cap screws that retain fuel cam
thrust washer to cam bearing support. Lift out fuel pump cam. Remove
fuel injection pump rack by removing nuts from thrust bearing re
tainer flange on front of crankcase front section and withdraw bolts.
Remove two cam bearing support cap screws. Remove support and
fuel injection pump rack.
(2 ) THRUST BEARING. With thrust bearing retainer and cam bear
ing support removed, press thrust bearing from crankcase front sec
tion. Remove fuel valve lifter retaining screws from fuel injection pump
pad on crankcase front section. Lift out fuel valve lifter.
(3) FUEL PUMP CONTROL. Remove cap screws holding body and
sleeve to crankcase, and lift off governor fuel pump control which is
located between No. 1 and No. 2 cylinders. Loosen cap screws that
lock fuel pump control dogs (fig. 64) to pump control shaft. These
40
--- Page 7 ---
TM 9-1756A
16
ORDNANCE MAINTENANCE - ORDNANCE ENGINE MODEL RD-1820 (CATERPILLAR)
ARBOR PRESS
MASTER ROD
RA PD 311016
Figure 42 — Removing Knuckle Pins, Using Wedges 5A2309
and Fixture 5A2308
(7) REMOVE KNUCKLE PIN LOCKING PLATE. Place master rod
and articulated assembly on a bench, rear end down. Bend down
knuckle pin lock screw tabs and remove lock screws and tabs. Lift off
knuckle pin locking plate (fig. 41).
(8) REMOVE KNUCKLE PINS. Place knuckle pin assembly and
disassembly fixture (5A2308) on an arbor press table (fig. 42). Lo
cate knuckle pin to be removed over a hole in fixture. Insert two
wedges (5A2309) between flanges of master rod, one on each side of
articulated rod to be removed, to prevent possible damage to master
rod flanges when pressing out knuckle pin. Press out knuckle pin,
using removing plug under arbor, fitting step of plug in step of
knuckle pin. Remove knuckle pin and articulated rod. Remove all
knuckle pins and articulated rods in same manner, each time moving
wedges tc respective articulated rod.
b. Cleaning. Wash all parts thoroughly in dry-cleaning solvent.
Clean bearings (par. 8 b).
c. Inspection.
(1) CRANKSHAFT FRONT AND REAR MAIN BEARINGS. Check fit of
the bearing on shaft and in crankcase (par. 22). Inspect rollers and
races, using a magnifying glass, for cracks and pitted or galled sur
faces. Examine retaining surfaces for cracks and wear (par. 8 c (11) ).
(2) CRANKSHAFT FRONT. Inspect crankshaft front for cracks.
50
--- Page 8 ---
TM 9-1756A
17
ORDNANCE MAINTENANCE - ORDNANCE ENGINE MODEL RD-1820 (CATERPILLAR)
INTERMEDIATE
DRIVE GEAR
Figure 47 — Accessor/ Drive Gears
rear cover and remove puller cap screws. Lift oil pump drive gear
(fig. 47) from supercharger rear housing.
(3) REMOVE IMPELLER DRIVE. Lift out accessory drive shaft,
making certain shaft splines do not scratch or score impeller shaft
bushings. Remove bronze thrust ring from recess in impeller shaft
retainer. Remove five screws which attach accessory drive gear rear
plate to shaft and remove plate. While disassembling Springs and
retaining pins from shaft, wrap a heavy cloth tightly around accessory
'drive gear and rear end of shaft, so that when the springs are driven
out of shaft they will not be free to fly. Stand the shaft on a dis
assembly bench, rear end down, and drive out springs and retaining
pins with a mallet. Remove cloth from shaft. Remove gear by turn
ing approximately 30 degrees to disengage internal lugs on gear from
mating ears on shaft. Remove the five flat head screws which secure
impeller shaft retainer to rear housing. Remove retainer, ring, shims,
spherical thrust ring, and steel washer.
(4) REMOVE IMPELLER AND IMPELLER SHAFT. Place strips of
light cardboard between impeller vanes and diffuser plate to protect
these parts during the following operations. Bend tab of impeller nut
lock out of slot of nut. Install impeller holding fixture (5A2170) on
supercharger rear housing (fig. 48). With impeller locked firmly, re
move impeller nut using lug wrench (5A2264). Remove impeller
nut lock and impeller shaft front oil sleeve and rings. Remove oil seal
60
--- Page 9 ---
TM 9-1756A
17
ORDNANCE MAINTENANCE - ORDNANCE ENGINE MODEL RD-1820 (CATERPILLAR)
rear housing cover. Place oil pump drive gear in position in super
charger rear housing, meshing with accessory drive gear (fig. 47).
(5) INSTALL SUPERCHARGER REAR COVER. Insure that parting
surfaces of supercharger rear housing and cover are clean and smooth.
Install new gaskets on supercharger rear housing. Lower cover onto
supercharger rear housing, making certain that ends of all shafts in
rear housing enter their respective bushings in rear cover. Secure
supercharger rear housing cover to rear cover by installing elastic
stop nuts on rear cover attaching studs. Install accessory drive cover
plate to rear supercharger housing cover, securing in place with elastic
stop nuts.
(6) ACCESSORY DRIVE (fig. 5l).
(a) Install Governor Drive. Install rubber seal in groove in gover
nor drive shaft bearing assembly. Insert governor drive shaft gear
through bearing assembly so that gear end of shaft is on anti-oil-seal
end of bearing assembly. Install key in shaft and place gear on key
and shaft so that large internal diameter hub is against bushing of
bearing assembly. Secure gear on shaft with nut and tab lock. Bend
lock up on nut and down on flat on gear. Place gasket over studs on
rear supercharger cover, lining up oil holes in gasket with oil holes in
cover and install bearing and gear assembly into rear cover, mating
large spur gear with supercharger drive shaft gear in rear housing.
Insure that rubber oil seal on bearing assembly enters rear housing
without binding.
(b) Assemble Governor and Revolution Counter Drive. Press
revolution counter drive shaft thrust button into accessory drive hous
ing. Install governor, revolution counter shaft, and plug assembly,
into bushing in housing. Place gasket over studs in housing. Install
rubber oil seals on governor drive shaft bushing assembly, and place
assembly over shaft into housing. Tighten bushing assembly, and check
end clearance of governor, revolution counter shaft, and plug assem
bly. If end clearance is below 0.013 inch, replace gasket under bearing
assembly to obtain this dimension. Install oil seal over shaft into
housing at splined end of shaft, and place governor drive coupling
in place at opposite end of shaft.
(c) Assemble Revolution Counter Drive. Place key in revolution
counter drive shaft. Install revolution counter drive gear over key and
shaft, so that extended hub will be towards end of shaft. Hold gear so
that distance from end of shaft to opposite face of gear is 0.878/0.870.
Drill a 0.0943- to 0.0938-inch diameter hole through shaft and gear by
piloting drill in hole in gear hub. Drive grooved locking pin through
hole to secure gear on shaft. In driving pin into hole, enter ungrooved
end of pin into hole first. Place revolution counter drive shaft assembly
in housing so that end of shaft bottoms on button in housing and gear
meshes with governor and transfer pump drive shaft gear. Place gasket
70
--- Page 10 ---
TM 9-1756A
21
ORDNANCE MAINTENANCE - ORDNANCE ENGINE MODEL RD 1820 (CATERPILLAR)
CYLINDER WRENCH
HOLD-DOWN
CAP SCREWS
RA PD 311033
Figure 66 — Tightening Cylinder Hold-down Cap Screws,
Using Wrench SA2268
(fig.66.)- (Refer to par. 42). Speed wrench (5A2269) is used to run
in cap screws. Lock wire cap screws.
g. Install Rocker Arms and Push Rod Housings.
(1) INSTALL VALVE TAPPET BALL SOCKETS. Insert each valve
tappet spring and valve tappet, insuring that all parts are thoroughly
coated with engine oil before assembly.
(2) INSTALL PUSH ROD HOUSINGS (fig. 31). Install short hose on
rocker end of push rod housing. The rocker end of push rod housing
may be identified by location of heading which is approximately %
inch from the end. Install long hose connections and two clamps per
connection on crankcase end of housing. The heading at this end of
housing is directly at the end. With hose connections and clamps
assembled on push rod housing, install housing on engine, pushing it
all the way on to its rocker arm connection and tighten clamp. Slide
crankcase end hose connection over tappet guide and tighten both
clamps. Oil push rod ends with clean engine oil and insert push rods
in housings through rocker box.
(3) INSTALL ROCKER ARMS (fig. 11). Loosen adjusting screws
and insert clamping screws in rocker arms. Do not tighten clamping
screws. Lubricate rocker arms and bolts with clean engine oil. Install
rocker arm and insert rocker bolt with spherical washer and rubber
80
--- Page 12 ---
TM
22
ORDNANCE MAINTENANCE - ORDNANCE ENGINE MODEL RD-1820 (CATERPILLAR)
d. Pistons and Cylinders.
fig Ref Manufacturing Replace
No. Key Fit Location Type Min Max if Beyond
69 AM Piston and ring, No. 1
groove Side O.OOSOL 0.0066L 0.0066L
69 AN Piston, ring, and spacer,
Nos. 3 and 4 Side 0.0025L 0.0042L 0.0042L
69 AO Piston Rings, Nos. 1 and 2 Gap 0.025 0.035
69 AP Piston and Pin Diam 0.000 0.001L 0.003L
69 AQ Piston pin and rod bush
ing Diam 0.0020L 0.0035L 0.006L
•\
69 AR Piston Rings, Nos. 3 and 4 Gap 0.01S 0.025
69 AS Piston and ring, No. 2 Side 0.0030L 0.0046L 0.0046L
Cylinder Barrel and
Piston
69 AT At No. 3 ring, parallel
to crankpin Diam 0.0355L 0.0385L 0.0485L
69 AT At No. 3 ring, 90° from
crankpin Diam 0.0195L 0.0225L 0.0325L
69 AU At bottom of skirt,
parallel to crankpin Diam 0.0335L 0.0365L 0.0465L
69 AU At bottom of skirt,
90° to crankpin Diam 0.0175L 0.0205L 0.0305L
69 AV Cylinder bore out of
round Diam 0.005
e. Air Heater.
69 AW Electrodes Gap 0.012 0.015
69 AX Nozzle orifice Diam 0.0670 0.0675
69 BA Pump shaft End 0.002L 0.004L 0.007L
69 BB Pump vane End 0.000 . 0.003L 0.007L
69 BD Pump rotor and housing Diam 0.001L 0.003L 0.006L
69 BE Pump shaft slot and vanes Side 0.002L 0.005L 0.010L
69 BF Pump shaft and bushing Diam 0.001L 0.003L 0.006L
69 BG Pinion and gear Backlash 0.0045 0.0065 0.0095
f. Accessory Drive.
69 BH Main drive gear and drive
gear Backlash 0.004 0.012 0.022
69 BI Governor drive shaft End 0.007 0.013 0.025
90
--- Page 13 ---
TM 9-1756A
26-29
ORDNANCE MAINTENANCE - ORDNANCE ENGINE MODEL RD-1820 (CATERPILLAR)
centrifugal force alone is sufficient to maintain blade contact. A seal
is incorporated in the pump to minimize-leakage around rotor shaft.
A composition rubber seal ring cushions the disk against retainer (lock
nut) and compensates for slight universal action of coupling. This seal
depends on a spring for sufficient thrust to be effective. The spring must
have sufficient tension to overcome pressure of fuel that may by-pass
around rotor shaft. A relief valve is contained in a separate housing
mounted on pump. The valve is of the poppet type and is controlled
by a spring whose tension can be varied by means of an external adjust
ing screw to provide any desired fuel pressure within the range of
adjustment. This relief valve also incorporates a by-pass valve to allow
fuel flow through pump when pump is inoperative.
27. EXTERNAL CLEANING AND INSPECTION.
a. Examine the unit for cracked housings and broken flanges.
Check the relief valve assembly for tightness to main body. Check
fittings for tightness.
28. DISASSEMBLY.
a. Remove Valve Assembly. Remove lock wire from relief valve
screws and two pipe plugs (fig. 70). Remove lock screw and lock plate
from drive end. Remove retainer. Remove seal, disk, drive shaft, spring,
and two washers by hand. Remove front bearing. With a scriber, mark
pump body and relief valve body on inlet side. The four vanes and
pin will fall out. Remove relief valve assembly by removing four cap
screws on corners of assembly.
b. Disassemble Pump. Heat rest of pump body to about 250°F.
in an oven or oil bath to eliminate unnecessary wear on sleeve and
bearings during disassembly. The sleeve and rear bearing can be re
moved by bumping parts out on a soft-wooden bench or block after
body has been heated. Do not attempt to disassemble relief valve
assembly.
29. CLEANING AND INSPECTION.
a. General. After disassembly, clean parts with dry-cleaning
solvent and inspect carefully for damage and wear. All defective parts,
as well as those indicating excessive wear, must be replaced (par. 22).
b. Blades. If sides of blades are rough or slightly scored, dress
them carefully on a new, flat oilstone being careful to maintain original
radius on edges. Smooth off any sharp corners at ends of blades which
might score bronze bearings but do not make them round.
c. Bearings. Slight scoring of bronze bearings may be corrected
by lapping carefully on a flat oilstone. Do not attempt to lap seal
surface of front bearing.
100
--- Page 14 ---
TM 9-1756A
43-45
ORDNANCE MAINTENANCE - ORDNANCE ENGINE MODEL RD-1820 (CATERPILLAR)
b. Replace Dowels and Studs. In case of any damage, the base
dowels and idler gear stud may be removed and new ones pressed
in place.
44. ASSEMBLY.
a. Assemble Ball Arm Head. Assemble ball arms on head with
pins and cotter pins. Place head assembly in case and hold in posi
tion. Put oil pump idler gear on stud and drive gear on spline. Place
gasket and base in position on case and attach with three machine
screws. Press collar on spline end until all en^ play is eliminated but
a free rotation of ball head is still possible.
b. Install Relief Valve. Place spring and valve in relief valve
sleeve and slip retaining pin in end hole. Tighten assembly in case.
Tighten plug and gasket in hole opposite relief valve.
c. Install Plunger and Linkage. Assemble floating lever and
speed adjusting lever to speeder spring fork with pins and lock wire.
Attach fork to spring top. Assemble spring seat and plunger. Place
retaining pin in position and tap pin in center to bend it slightly and
prevent it from falling out, Attach spring to seat. Slide bearing on
plunger and carefully place plunger and attached parts in hole in ball
arm head. Plunger must be free to move up and down in ball arm
head. Install speed adjusting shaft sleeve and gasket by screwing
into case. Place shaft in sleeve, and attach speed adjusting lever to
shaft with a cotter pin. Install two seals, back to back, in sleeve end.
Install spacer and gasket in case. Install terminal lever sleeve in case
by pressing into position. Place terminal lever in position, and install
two terminal shafts. Lock lever to shafts with cotter pins. Install a
new core plug in short terminal shaft sleeve. Install two seals, back
to back, in long terminal shaft sleeve end. Place droop adjusting
bracket in position and lock in place with cap screw and washer.
d. Install Speed Stops and Cover. Install high speed stop and
nut in cover. Install cover and gasket and attach with three machine
screws and two washers.
45. INSTALLATION.
a. Install Governor. Place gasket and governor on studs and at
tach with four nuts (fig. 73). Be certain governor name plate faces
engine.
b. Install Control Rods. Connect control rods with bolts running
through yoke ends and secure with nuts and cotter pins.
c. Install Spring Controlled Levers. The two spring controlled
levers are attached to their shafts by a taper pin and a cap screw.
Drive taper pin in position, tighten cap screw and lock with lock wire
110
--- Page 15 ---
TM 9-1756A
57-59
ORDNANCE MAINTENANCE - ORDNANCE ENGINE MODEL RD-1820 (CATERPILLAR)
b. Inspection. Inspect the pinion screw shaft for gummy deposits
and remove with dry-cleaning solvent if present. Lubricate screw with
light oil only.
58. DISASSEMBLY.
a. Remove Drive. Mark relative location of field ring, intermediate
housing, and Bendix drive housing (fig. 78). Remove Bendix hous
ing from intermediate housing. Remove bearing retainer and bearing.
Unscrew Bendix drive set screw and slide drive off armature shaft
b. Remove Intermediate Housing. Remove cap screws from in
termediate housing and pull housing off shaft away from field ring.
Remove oil seal retainers from each end of housing and remove seals,
bearing and sleeve.
c. Remove Armature. Remove armature from field ring, being
careful not to damage insulation or commutator.
d. Remove Brush Holder Housing. Mark location of stud and
screws in brush holder housing. Also mark location of brush assem
blies. Remove stud nuts, washers, cap screws and washer from brush
holder housing end Remove jumper and insulators. Mark relative
location of field ring and brush holder housing. Remove band and
remove brush holder housing from field ring.
e. Disassemble Field Ring. Remove bolts, nuts, and insulators,
from side terminal. Remove eight screws from field ring and slide
coil and pole piece out brush end.
f. Disassemble Brush Holder Housing. Remove two cap screws
supporting each brush holder assembly and remove four assemblies.
Remove bearing retainers, oil seal, sleeve, and bearing, from brush
holder housing.
59. CLEANING AND INSPECTION.
a. Cleaning. Wash Bendix housing, brush holders, intermediate
housing, field ring, band end and brush holder housing in dry-cleaning
solvent. Clean Bendix housing bearing retainer, housing oil seal re
tainers, commutator end bearing retainer and seal retainer by wash
ing. CAUTION: Do not wash Bendix drive clutch in cleaning fluids
and do not lubricate. Clean drive clutch, armature, jumper and field
coil by blowing with dry compressed air or by wiping with a clean
cloth. Brushes may be cleaned with oil free gasoline if they are dried
before being used. CAUTION: Do not soak brushes. Any caked
substances may be removed with No. 00 flintpaper. Do not change
brush size by sandpapering and do not round contact surface of brush.
Wash and oil bearings after cleaning. Wash nuts, washers, screws
and studs in dry-cleaning solvent. If commutator becomes slightly
120
--- Page 16 ---
TM 9-1756A
71
ORDNANCE MAINTENANCE - ORDNANCE ENGINE MODEL RD-1820 (CATERPILLAR)
Manufacturer's Number
Part Number Nome Required
CME-5A2182 Protector, cover for engine................................ 1
CME-5A2342 Protector, crankshaft end ................................ 1
WAC-800986
CME-5A2159 Protector, master and articulated rods.............. 9
CME-5A1442 Protector plug, fuel lines.................................... 18
CME-5A2305 Puller, cam bearing............................................ 1
WAC-84535
CME-5A2304 Puller, crankshaft bearing ................................ 1
WAC-800377
CME-5A2299 Puller, crankshaft rear main bearing................ 1
WAC-84559
CME-5A2298 Puller, crankshaft front main bearing inner
WAC-84562 race, removing (used with WAC-85464).... 1
CME-5A2276 Puller, rocker arm hub bolt bushing, removing
WAC-800099 and installing ................................................ 1
CME-5A2263 Puller, supercharger impeller, removing and in
WAC-800304 stalling (used with WAC-800307 )................ 1
CME-5A2282 Puller, valve tappet guide, installing................ 1
WAC-84802
CME-5A2275 Reamer, exhaust valve guide cylinder hole,
WAC-83477 hand expansion (0.005 oversize)................ 1
CME-5A2272 Reamer, intake valve guide cylinder hole, hand
WAC-800341 expansion (0.7233 diam.) (0.005 oversize) . 1
CME-5A2280 Reamer, rocker arm hub bolt bushing ........... 1
WAC-800108
CME-5A2301 Screw, crankshaft rear, removing and installing
WAC-84699 (used with WAC-84765).............................. 1
CME-5A2228 Sling, lifting engine assembly ................ 1
CME-5A2300 Spreader, crankshaft, rear crankcheek (used
WAC-84765 with WAC-84699) ...................................... 1
CME-5A2302 Stop, crankshaft front and rear counterweight
WAG-83445 bushing, installing ........................................ 1
CME-5A2155 Stud assembly, remove and replace clutch
springs .......................................................... 4
CME-5A2164 Timing disk, ' fuel pump lifter and engine
valves ........................................................... 1
CME-5A2309 Wedges, support master rod flanges ................. 2
W AC-8002 82
CME-5A2 306 Wrench, crankcase front main section to rear
WAC-84356 section nuts .................................................. 1
CME-5A2339 Wrench, crankshaft cheek capscrew, remove
WAC-80309 andreplace .................................................... 1
130
--- Page 17 ---
TM 9-1765A
*C 1
TECHNICAL MANUAL
ORDNANCE MAINTENANCE
AXLES, PROPELLER SHAFTS, AND WHEELS FOR
BOMB SERVICE TRUCK M6 AND li/2 -TON 4X4 TRUCKS
(CHEVROLET), INCLUDING TELEPHONE EARTH
BORER (K-44)
CHANCES 1 WAR DEPARTMENT.
No. 1 | - WASHINGTON 25, D. C., 2 March 1945
TM 9-1765A, 15 December 1942, is changed as follows:
Change title of manual to read: AXLES, PROPELLER SHAFTS,
AND WHEELS FOR BOMB SERVICE TRUCK M6 AND iy2 -TON
4X4 TRUCKS (CHEVROLET). INCLUDING TELEPHONE
EARTH BORER (K-44).
Chaper 6 is added as new material; present chapter 6 is changed
to Appendix.
Chapter 6 (Added)
EARTH BORER EQUIPMENT HD
Section I
GENERAL
Paragraph
Description and operation___________—__________________ 80
80. DESCRIPTION AND OPERATION.
a. Description (figs. 57 and 58). The earth borer equipment HD is
a machine designed for digging holes in various types of soil, by power,
for setting telephone poles and placing guy anchors. The machine is
equipped with an integral derrick for setting telephone poles after
the hole lias been dug. The equipment includes the main supporting
case tube, which is a steel sheii"~attached to two mounting bases with
cap screws. Tltid steel shell supports the clutch case, which houses
the feed and driving clutches, and brakes at one end, and supports the
intermediate and boring cases at the other end. These latter cases
project to the rear of and overhang the last body platform cross
bearer. The main supporting case tube also houses the main drive and
feed shafts. The intermediate case contains the intermediate drive
and feed gear trains and has mounted on it the two leveling worms
and wheel drives which serve when the main boring case is shifted into
position. The boring case contains the final feed and drive gears, and
the rack shaft boring head. The rack shaft, on which the earth auger
•These changes, together with C 1 (when published), TM 9-805, supersede TM 11-364, 24
September 1942.
AGO 39C—Mar. 622803°—45———1
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AXLES, PROPELLER SHAFTS, AND WHEELS
(6) Install drive sprocket key on shaft and install sprocket with
washer, nut, and cotter pin.
Note. When replacing bearing retainer oil seals, press in new seals so edge
of leather will be toward sprocket shaft gear.
c. Install Clutch Sprocket Intermediate Gear Assembly.
(1) With clutch case removed as explained in paragraph 81a (5),
and with clutch sprocket gear previously installed proceed with
assembly.
(2) If bushing has been removed from gear, press bushing into gear.
(3) Place clutch sprocket intermediate gear into position inside
clutch case, install shaft, and lock with nut and cotter pin.
d. Assemble Clutch and Brake Assembly and Install in
Main Supporting Clutch Case.
(1) Before beginning assembly of clutch and brake assembly, install
first reduction drive and feed shaft assemblies in machines as de
scribed in a above.
(2) When assembling the feed clutch and brake assembly on feed
shaft, start by slipping the brake spacer and feed brake shell over the
clutch and brake hub; then install an internal-toothed clutch plate
against spacer; next install external-toothed clutch plate. Continue
to install clutch plates alternately until a total of nine external-toothed
plates have been installed. Complete this assembly with two internal -
toothed plates.
(3) Install throw collar and commence assembly of plates with two
internal-toothed plates; next install external-toothed plate. Con
tinue assembly of clutch plates until a total of nine external-toothed
plates have been assembled. Complete assembly with one internal-
toothed plate.
(4) Install clutch spacer with the flat side against the plates; then
install main drive gear and clutch shell bearing, locking washer and
feed shaft nut. Tighten nut securely and bend over tang of locking
washer to lock the nut".
(5) Assemble main drive gear and clutch shell over shell bearing.
Install drive sleeve on drive shaft, and seat clutch shell bearing in the
main drive gear and clutch shell.
(6) Install spacer and then install internal-toothed clutch plate
against spacer, then assemble an external-toothed plate. Continue