SERViCE MANUAL
gear (12). Pump gears (12 and 13) are serviced as a
matched set and if either gear is faulty, renew both
gears.
Gear
(13)
is a shrink fit on shaft (2) and if faulty,
split the gear to remove. Withdraw drive gear and
shaft (2).
Remove cotter pin (17), then remove washer (20),
spring
(19)
and relief valve
(18).
Specifications for re-
lief valve are as follows:
Valve diameter 0.825-0.827 in.
(20.95-21.01 mm)
Valve clearance in bore 0.003-0.007 in.
(0.076-0.178 mm)
Valve spring (used):
Free length 2.52 in.
(64.00 mm)
Test length 1.858 in.
(47.19 mm)
Ifest load 18.0-20.0 lbs.
(80.06-88.96 N)
Valve spring (new):
Free length 2.85 in.
(72.39 mm)
Test length 1.86 in.
(47.24 mm)
Ifest load 33.0 lbs.
(146.78 N)
Inspect all parts for scoring, excessive wear or other
damage. Check pump against the following specifi-
cations:
Drive shaft end play (cover
installed) 0.000-0.002 in.
(0.000-0.051 mm)
Drive shaft running clearance
in bushings 0.001-0.003 in.
(0.025-0.076 mm)
Radial clearance (gears
to body) 0.007-0.012 in.
(0.178-0.305 mm)
Paragraphs 59-60
Idler gear end play 0.000-0.002 in.
(0.000-0.051 mm)
Oil pressure at rated rpm and
194-212° F (90-100° C) 40-60 psi
(275-414 kPa)
When installing gear (13), heat gear in a bearing
oven to a temperature of 395-750° F (200-400°
C)
and
slide on drive shaft until tight against a 0.004 inch
(0.1016 mm) feeler gage.
WARNING: Always wear heat protective gioves
when handiing heated parts.
Tighten body bolts (1) evenly using a crosswise se-
quence. Install idler gear (8) with short hub side to-
ward oil pump. Using a new nut (3), tighten nut un-
til idler gear end play is 0.000-0.002 inch (0.000-0.051
mm).
Reinstall oil pump assembly. Use new *'O'' rings (15
and 21) when installing oil pressure and suction pipe
assembly. Balance of reassembly is the reverse of dis-
assembly.
OiL PAN
Aii Modeis
59.
REMOVE AND REINSTALL. Ib remove the
oil pan, place a jack under the clutch housing. Re-
move drain plug and drain oil. Remove the lower four
bolts and loosen the upper two bolts in the front sup-
port to engine. Unbolt oil pan from clutch housing.
Place a floor jack under oil pan, remove pan bolts and
lower oil pan from tractor.
Use new gasket and reinstall oil pan. Tighten pan
bolts evenly to a torque of 24 ft.-lbs. (32
N-m).
Tight-
en clutch housing bolts to a torque of 80 ft.-lbs. (108
N-m) and front support bolts to a torque of 220 ft.-
lbs.
(298
N-m).
Fill crankcase to proper level with new
oil.
DIESEL FUEL SYSTEM
The diesel fuel system on all models is the di-
rect iivjection type equipped with a Robert Bosch
iiyection pump.
When servicing any unit of the diesel fuel sys-
tem,
the maintenance of absolute cleanliness is
of utmost importance. Of equal importance is the
avoidance of nicks or burrs on any of the work-
ing parts.
Probably the most important precaution that
service personnel can impart to owners of diesel
powered tractors, is to urge them to use an ap-
proved fuel that is absolutely clean and free from
foreign material. Extra precaution should be tak-
en to make certain that no water enters the fuel
storage tank.
FiLTERS AND BLEEDiNG
Aii Modeis
60.
All models are equipped with two diesel fuel
filters.
On Models 385 and 485, the primary filter is
located on right side of engine and the secondary fil-
ter is on the left side. See Fig. 56. On Models
585,
685
and 885, both filters are on left side of engine (Fig.
57).
Ib renew filter elements, first shut off fuel valve
on models without cab. Then, on all models, open air
vent screws at each filter head. Open drain valves
and allow fuel to drain from filters. Using a strap
wrench or filter wrench, unscrew and remove pri-
mary and secondary filters.
41
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