Section Ill. ROCK AND SAND CONVEYOR DRIVES
The rock and sand conveyor drive components are
similar in construction and maintenance procedures. A
gear box, countershaft, and speed reducer are the major
components in the drive assembly. The rock and sand
conveyor drive assemblies are belt driven and
controlled by twin disc clutch assemblies located on both
ends of the screen and side conveyor countershaft.
59. Sand Conveyor Drive
a. Removal and Disassembly
(1) Remove the main countershaft-t lower
countershaft guard, and the lower countershaft-to-sand
conveyor drive guard.
(2) The sand conveyor drive is shown
Figure 35-1. Sand conveyor drive, removal and
sand conveyor drive in the numerical sequence as
b. Speed Reducer Disassembly
(5) Perform a magnetic inspection of all
(1) Drain lubricant from speed reducer.
gears and shafts. Inspect gear teeth for wear, pitting,
chipping, nicks, cracks, or scoring. Replace defective
(2) Disassemble speed reducer in the
numerical sequence as illustrated on figure 35-3.
(6) Inspect shafts for wear or bent condition.
c. Bearing Disassembly. Disassemble the bearing
Inspect splined shafts for twisted splines. Replace a
d. Gear Box Disassembly
(7) Inspect the speed reducer output hub for
(1) Drain lubricant from gear box.
wear, burrs, or nicks. Replace a defective hub.
(2) Disassemble gear box in the numerical
(8) Inspect all housings and covers to see
that mating surfaces, and housing bores are free from
shims (8A, 8B, and 8C) or (24A, 24B, 24C) until a slight
nicks or burrs. Inspect for cracks or breaks. Repair or
clearance of .006 to .008 inch is obtained between gear
replace defective parts.
and pinion. Clearance can be determined by holding
(9) Replace all gaskets.
one shaft and rotating the other shaft.
(10) Thoroughly inspect all parts for wear or
damage. Replace defective parts as necessary.
Install grease seals so knife edge of
seals counting the revolving shaft
and coupling is turned in toward
f. Gear Box Reassembly.
cater of gear box.
e. Cleaning, Inspection, and Repair
(1) Reassemble gear box in the reverse of
(1) Clean all parts in an approved cleaning
solvent and dry thoroughly.
Insert or remove shims (8A, 8B, and 8C) or (24A, 24B,
and 24C) until a slight clearance of .006 to .008 inch is
(2) Inspect the coupling chain for broken
obtained between gear and pinion. Clearance can be
links. Replace damaged links as necessary.
determined by holding one shaft and rotating the other
(3) Inspect all oil seals for burrs or nicks.
Replace a defective seal.
(4) Inspect all bearings for wear, scoring, or