Loader Bobcat 773. Instruction - page 107
773 BICS Loader
–9–7–
Service Manual
ENGINE SPECIFICATIONS (Cont’d)
All dimensions are given in inches. Respective metric dimensions are given in millimeters enclosed by parentheses.
Crankshaft
Crankshaft Alignment Limit Permitted
0.0031 (0,08)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Clearance Between Journal & Bearing #1
0.0016–0.0046 (0,04–0,117)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Limit Permitted
0.008 (0,2)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Journal O.D. #1
2.0441–2.0449 (51,921[51,94)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bearing I.D. #1
2.0465–2.0488 (51,98–52,04)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Clearance Between Journal & Bearing #2
0.0016–0.0041 (0,04–0,104)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Limit Permitted
0.008 (0,2)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Journal O.D. #2
2.0441–2.0449 (51,92–51,94)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bearing I.D. #2
2.0465–2.0482 (51,98–52,02)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Clearance Between Crank Pin & Bearing
0.0009–0.0034 (0,023–0,086)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Limit Permitted
0.008 (0,2)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Crank Pin O.D.
1.8488–1.8492 (46,96–46,97)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Crank Pin Bearing I.D.
1.8504–1.8522 (47,0–47,046)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Crankshaft Side Clearance
0.0059–0.0122 (0,15–0,31)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Limit Permitted
0.020 (0,5)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Timing Gear
Timing Gear Backlash
Crank Gear – Idle Gear
0.0016–0.0044 (0,041–0,112)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Idle Gear – Cam Gear
0.0016–0.0045 (0,041–0,114)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Idle Gear – Injection Pump Gear
0.0016–0.0046 (0,041–0,117)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Idle Gear – Oil Pump Gear
0.0016–0.0043 (0,041–0,109)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Limit Permitted
0.006 (0,15)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clearance Between Idle Gear Shaft & Idle Gear Bushing
0.001–0.0026 (0,025–0,066)
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Limit Permitted
0.004 (0,10)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Idler Gear Side Clearance Idler Gear
0.008–0.020 (0,2–0,51)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermostat
Valve Opening Temperature
157–163
°
F (70–73
°
C)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Valve Fully Open
185
°
F (85
°
C)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ENGINE SPECIFICATIONS (Cont’d)
Crankshaft Re–Grind Data
if the standard size bearing cannot be employed due to
excessive wear of the crankpin and crank journal use
undersize or oversize bearings.
For undersize or oversize bearing use, follow the
precautions noted below.
Grind the crankpin and journal with a wheel which has
specified round corner and width without shoulder [A].
1. 0.1299–0.1457’’ (3,3–3,7 mm)
2. 0.1102–0.1260’’ (2,8–3,2 mm)
3. Be sure to chamfer the oil hole circumference to
0.04–0.06’’ (1,0–1,5 mm) radius with and oil stone.
4. The crankpin must be fine finished to higher than
(0,4–5).
5. The crank journal must be fine–finished to higher
than (0,4–5).
6. The crank journal side surface must be
fine–finished to higher than (1,6–5).
A
PI–10026
3
2
5
2
2
1
4
SIZE
CODE NO.
NAME OF BEARING
BEARING MARK CRANKSHAFT PROCESSING DIM.
–0.008’’
Crankshaft Bearing 1
(0,2 mm)
17331–2391–1
0.008’’ minus (0,2 minus)
020 US
2.0363–2.037’’
–0.008’’
Crankshaft Bearing 2
(51,721–51,74 mm)
(0,2 mm)
17331–2393–1
0.008’’ minus (0,2 minus)
020 US
–0.016’’
Crankshaft Bearing 1
A
(0,4 mm)
17331–2392–1
0.016’’ minus (0,4 minus)
040 US
2.0284–2.0291’’
–0.016’’
Crankshaft Bearing 2
(51,521–51.54 mm)
(0,4 mm)
17331–2394–1
0.016’’ minus (0,4 minus)
040 US
–0.008’’
Crank Pin Bearing
1.8409–1.8415’’
(0,2 mm)
17331–2297–1
0.008’’ minus (0,2 minus)
020 US
(46,759–46,775 mm)
B
–0.016’’
Crank Pin Bearing
1.8330–1.8337’’
(0,4 mm)
17331–2298–1
0.016’’ minus (0,4 minus)
040 US
(46,559–46,575 mm)
Thrust Bearing 1 – 0.008’’ plus
+0.008’’
15221–2395–1
(0,2 mm plus)
020 US
(+0,2 mm)
1.8330–1.8337’’
Thrust Bearing 2 – 0.008’’ plus
(46,559–46,575 mm)
19202–2397–1
(0,2 mm plus)
C
Thrust Bearing 1 – 0.016’’ plus
+0.016’’
15221–2396–1
(0,4 mm plus)
040 US
1.0315–1.0335’’
(+0,4 mm)
(26,20–25,25 mm)
Thrust Bearing 2 – 0.016’’ plus
19202–2398–1
(0,4 mm plus)
–9–8–
773 BICS Loader
Service Manual
Material
Thread Size
(Dia. x Pitch)
Head Mark 4
Head Mark 7
Head Mark 10
M 5 x 0.8
3–4 ft.–lbs.
(4–5 Nm)
M 6 x 1.0
6–7 ft.–lbs.
6–9 ft.–lbs.
(8–9 Nm)
(8–12 Nm)
M 8 x 1.25
6–9 ft.–lbs.
11–16 ft.–lbs.
18–25 ft.–lbs.
(8–12 Nm)
(15–22 Nm)
(24–34 Nm)
M 10 x 1.25
13–18 ft.–lbs.
22–30 ft.–lbs.
36–50 ft.–lbs.
(18–24 Nm)
(30–41 Nm)
(49–68 Nm)
M 12 x 1.25
22–30 ft.–lbs.
40–54 ft.–lbs.
69–87 ft.–lbs.
(30–41 Nm)
(54–73 Nm)
(94–118 Nm)
M 14 x 1.25
36–50 ft.–lbs.
58–80 ft.–lbs.
116–137 ft.–lbs.
(49–68 Nm)
(79–108 Nm)
(157–186 Nm)
ENGINE SPECIFICATIONS (Cont’d)
Torque For General Metric Bolts
Revised May 98
773 BICS Loader
–9–9–
Service Manual
HYDRAULIC CONNECTION SPECIFICATIONS
O–ring Face Seal Connection
When the fitting is tightened, you can feel when the fitting
is tight to eliminate leakage caused by under or over
torqued fittings. Use vaseline petroleum jelly to hold the
O–ring in position until the fittings are assembled [A].
Straight Thread O–ring Fitting
Lubricate the O–ring before installing the fitting. Loosen
the jam nut and install the fitting. Tighten the jam nut until
the washer is tight against the surface [B].
Tubelines And Hoses
Replace any tubelines that are bent or flattened. They will
restrict flow, which will slow hydraulic action and cause
heat.
Replace hoses which show signs of wear, damage or
weather cracked rubber.
Always use two wrenches when loosening and tightening
hose or tubeline fittings.
Flare Fitting
Use the following procedure to tighten the flare fitting:
Tighten the nut until it makes contact with the seat. Make
a mark across the flats of both the male and female parts
of the connection (Item 1) [C].
Use the chart below to find the correct tightness needed
(Item 2) [C]. If the fitting leaks after tightening, disconnect
it and inspect the seat area for damage.
When repairing hydrostatic and hydraulic
systems, clean the work area before
disassembly and keep all parts clean. Always
use caps and plugs on hoses, tubelines and
ports to keep dirt out. Dirt can quickly damage
the system.
I–2003–0888
A
B–07575
Tubeline
TORQUE
NEW
RE–ASSEMBLY
Outside
Ft.–lbs.
Rotate No.
Rotate No.
Wrench Size
Diameter
Thread Size
(Nm)
of Hex Flats
of Hex Flats
5/8’’
5/16’’
1/2’’ – 20
17 (23)
2–1/2
1
11/16’’
3/8’’
9/16’’ – 18
22 (30)
2
1
7/8’’
1/2’’
3/4’’ – 16
40 (54)
2
1
1’’
5/8’’
7/8’’ – 14
60 (81)
1–1/2
1
1–1/4’’
3/4’’
1–1/16’’ – 12
84 (114)
1
3/4
1–3/8’’
1’’
1–5/16’’ – 12
118 (160)
3/4
3/4
Flare Fitting Tightening Torque
Revised May 98
C
TS–01619
1
2
B
A–01852
Nut
Nut
Washer
Washer
O–ring
O–ring
–9–10–
773 BICS Loader
Service Manual