Loader Bobcat 773. Instruction - page 107

773 BICS Loader

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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)

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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

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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

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773 BICS Loader

Service Manual

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