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Case IH 685, 485 Tractor Range transmission - 2 WD and 4 wheel drive
To remove the bevel pinion mainshaft (2), remove snap ring (14) from
groove in pinion shaft. Unbolt retaining plates (6) and move bevel
pinion shaft rearward.
Remove Hi sliding collar (16), Lo-Reverse gear (15), snap ring (14) and
four-wheel drive gear (13), if so equipped. Remove pinion mainshaft
assembly and shims (10) from transmission case.
Measure and note thickness of shims (10) if the same bevel pinion main
shaft is to be reinstalled. Using a dial indicator, measure end play of
bearing housing (8) on bearings (7 and 9).
If end play is more than 0.003 inch (0,076 mm), renew the bearings as
follows:
Remove snap ring (12) and spacer (11), then press bearings and housing
from bevel pinion main shaft. Press new bearings (7 and 9) and housing
(8) on bevel pinion while rotating the housing.
Apply pressure until a slight preload can be felt. Install spacer (11).
Snap ring (12) is available in thicknesses of 0.066, 0.069, 0,072,
0.075, 0.078, 0.081, 0.084, 0.087, 0.090 and 0.093 inch (1.67, 1.75,
1.83, 1.90, 1.98, 2.06, 2.13, 2.21, 2.28 and 2.36 mm).
Select the thinnest snap ring, 0,066 inch (1.67 mm) and install in its
groove. Make certain that bearing (9) and spacer (11) are tight against
snap ring (12), then using a dial indicator, measure end play of housing
(8) on bearings (7 and 9).
Add the end play to the thickness of installed snap ring. The result is
the correct thickness of snap ring to be installed. Remove the thin snap
ring and install the new one. This assembly will now have a maximum end
play of 0.003 inch (0.076 mm) or a maximum preload of 0.002 inch (0.050
mm).
Fig.29
View showing distances (A, B and C) used In setting pinion position. To
remove the countershaft (25), remove snap ring (18) and remove snap ring
(24) from its groove in countershaft. Drive a wedge into split in spacer
(22).
Move countershaft forward and remove snap ring (24), Lo gear (23), split
spacer (22) and constant mesh gear (21) as countershaft is withdrawn.
Remove snap ring (17), then press ball bearing from countershaft. Pump
drive gear (29) is located on pto driven shaft and rides in needle
bearing (27).
If necessary, countershaft needle bearing and pump gear needle bearing
(27) can now be removed. Note position of needle bearings before
removing. To remove the reverse idler gear (35) and shaft (32), drive
out roll pin (33).
Withdraw shaft (32) and remove reverse idler gear (35) with needle
bearings (34 and 37) and spacer (36), then remove thrust washers (31 and
38).
Clean and inspect all parts and renew any showing excessive wear or
other damage. If bevel pinion mainshaft must be renewed, bevel ring gear
(1) must also be renewed as they are available only as a matched set.
To set bevel pinion main shaft position,
install bearings (7 and 9), housing (8), spacer (11) and correct snap
ring (12) as outlined previously, then proceed as follows:
The mounting distance (A) from pinion bearing housing mounting face to
the center line of the differential is approximately 6.600 inches
(167.64 mm).
This distance may vary for each tractor. To aid in accurate installation
of the pinion main-shaft, a single figure is stamped on the top face of
the upper pto shaft boss.
The single figure indicates (in inches) the variation from distance (A)
in steps of 0.001 inch (0.025 mm). When distance (A) is smaller, a minus
sign will be shown in front of single figure.
Add or subtract the single figure to the approximate distance 6.600
inches (167.64 mm). The pinion cone mounting distance (B) is marked (in
inches) on the rear face of the pinion and shows the distance this face
must be from center line of differential. The distance will be
approximately 4.410 inches (112.01 mm).
Stand pinion shaft on a flat surface. Measure distance from pinion face
to the bearing housing mounting face. This is distance (C). Add distance
(C) to the marked figure on pinion face (distance B) and subtract from
the resulting (distance A).
The final figure is the correct thickness of shims (10) to be installed
for correct pinion mainshaft position. The balance of reassembly is the
reverse of disassembly procedures.
Fig.30. Case 685, 485, 585, 385, 885 tractors Range transmission
used on 2WD and 4WD models. Note the heavy duty park brake drum (flange)
on bevel ring gear
1.Bevel ring gear, 2.Bevel pinion mainshaft, 3.Cap screw, 4.Washer,
5.Lock collar, 6.Retaining plates, 7.Bearing, rear, 8.Bearing housing,
9.Bearing, front, 10.Shim, 11.Spacer, 12.Snap ring, 13.Front-wheel drive
gear, 14.Snap ring, 15.Lo-Reverse gear, 16.Hi sliding collar, 17.Snap
ring, 18.Snap ring, 19.Ball bearing, 20.Snap ring, 21.Constant mesh
gear, 22.Split spacer, 23.Lo gear, 24.Snap ring, 25.Countershaft,
26.Countershaft needle bearing, 27.Pump drive gear needle bearing,
28.Snap ring, 29.Pump drive gear, 30.Snap ring, 31.Thrust washer,
32.Shaft, 33.Roll pin, 34.Needle bearing, 35.Reverse idler gear,
36.Spacer, 37.Needle bearing, 38.Thrust washer
Transfer lube pump
REMOVE AND REINSTALL
The transfer lube pump is located below the reverse idler gear in range
gearbox. The pump furnishes oil for lubricating the Case IH 685, 485
speed transmission mainshaft and synchronizers and the ring gear and
pinion.
Fig.31. Partially disassembled transfer pump and relative
components
1.Lube tube, 2.Strainer, 3.End cover, 4.Pump, 5.Allen set screw, 6,Key,
7.Gear, 8.Snap ring
To remove the transfer pump, first remove all other range tractor
transmission. Then, disconnect and remove lubrication tube (1). Remove
snap ring (8) and drive gear (7),
Remove Allen set screw (5) through hole in bottom of rear main frame
shown in Figure. Remove pump from transmission housing. Unbolt and
remove strainer (2), then remove end cover (3).
Clean and inspect all parts. Internal parts of pump (4) are not
available separately. Reassemble and reinstall transfer pump by
reversing the disassemble and removal procedures.
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CASE IH TRACTORS SPECIFICATIONS |
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CASE IH FRONT END LOADERS SPECS |
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