Service manual
Hydraulic System
Pump Engine driven gear type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pump Capacity 18.0 GPM (68,1 L/min.) @ 2750 RPM @ 1150 PSI (7929 kPa). . . . . . . . . . . . . . . . . . . . .
System Main Relief 2550–2600 PSI (17580–17924 kPa) @ Quick Couplers. . . . . . . . . . . . . . . . . .
Filters (charge & implement) Full flow replaceable 4 micron synthetic medial element. . . . . . . . . .
Hydraulic Cylinders Doubleacting. . . . . . . . . . . . . . . . . . .
Bore Diameter:
Lift Cylinder (2) 2.25 (57,2). . . . . . . . . . . . . . . . . . . .
Tilt Cylinder (1) 3.25 (82,6). . . . . . . . . . . . . . . . . . . .
Rod Diameter:
Lift Cylinder (2) 1.50 (38,1). . . . . . . . . . . . . . . . . . . .
Tilt Cylinder (1) 1.50 (38,1). . . . . . . . . . . . . . . . . . . .
Stroke:
Lift Cylinder (2) 33.5 (851). . . . . . . . . . . . . . . . . . . .
Tilt Cylinder (1) 18.9 (480). . . . . . . . . . . . . . . . . . . .
Control Valve 3–spool, open center, series type W/float detent on lift,. . . . . . . . . . . . . . . . . . . . . . .
single spool electrical control front auxiliaries.
Fluid Lines SAE standard tubes, hoses & fittings. . . . . . . . . . . . . . . . . . . . . . . . .
Hydraulic Function Time:
Raise Lift Arms to Maximum Height 4.0 Seconds. . . .
Lower Lift Arms from Maximum Height 3.4 Seconds.
Move Empty Bucket to Dump Position 2.3 Seconds.
Move Bucket to Retracted Position 1.9 Seconds. . . .
Fluid Type Bobcat Fluid (P/N 6563328); If fluid is not available, use. . . . . . . . . . . . . . . . . . . . . . . . . . .
10W–30/10W–40 Class SE, SF, SG Motor Oil for temperatures above 0
o
F (–18
o
C)
& 5W–30 Motor Oil for temperatures below 0
o
F (–18
o
C).
Electrical
Alternator Belt drive, 55 amps. Open. . . . . . . . . . . . . . . . . . . . . . . . . .
Battery 12 volt, 700 cold crank amps. @ 0
o
F (–18
o
C) 170 min. reserve capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starter 12 volt, 3.7 HP (2,8 kW). . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drive System
Transmission Tandem hydro. pumps infinitely variable, driving 2 fully reversing hydrostatic motors. . . . . . . . . . . . . . . . . . . . . . .
Final Drive Gear Reduction & #100 HS roller chain & . . . . . . . . . . . . . . . . . . . . . . . . .
sprockets in sealed chaincase with oil lubrication
Total Engine to Wheel Reduction 47:27:1. . . . . .
Capacities
Cooling System 22 qts. (20,8 L). . . . . . . . . . . . . . . . . . . . .
Fuel 25 gals. (95 L). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Oil W/Filter 8 qts. (7,6 L). . . . . . . . . . . . . . . . . .
Hydraulic Reservoir 15.5 qts. (14.7 L). . . . . . . . . . . . . . . . . .
Hydraulic/Hydrostatic System 8 gals. (30,3 L). . . . . . . . .
Chaincase Reservoir 9 gals. (34,1 L). . . . . . . . . . . . . . . .
Tires
Standard 8.25–15, 6 Ply Rating, Nylon with Bar Lug Tread. . . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure 45–50 PSI (310–345 kPa). . . . . . . . . . . . . . . . . . . . . . . . . .
Flotation 12:00–16,5, 6 Ply Rating, Nylon with Sure Grip Lug. . . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure 30–35 PSI (207–240 kPa). . . . . . . . . . . . . . . . . . . . . . . . . .
LOADER SPECIFICATIONS (Cont’d)
–9–4–
853, 853H Loader
Service Manual