Bucket Shimming Procedures - Doosan DX700LC Operation And Maintenance Manual

BUCKET SHIMMING
PROCEDURES
New Bucket Installation
1. If a new bucket is being installed on the excavator,
measure the inside dimension between the bucket ears
and the outside dimension across the arm mounting boss.
2. Subtract the clearance on both sides from the difference of
the two and shim accordingly, before assembly.
To check end play (side-to-side) clearance at bucket
attachment point, the bucket must be free to move but at all
other times lower it to the ground or use support blocks to
immobilize this assembly. Shut off engine and tag and lock
out controls to prevent movement during this procedure.
Shimming Procedures for Installed Bucket
1. With bucket attached, curl bucket and arm outward and
lower boom so that bucket teeth are pointing away from
excavator, just a few inches off ground. This position
provides easy accessibility for dimensional measurements.
2. Force bucket to one side and check for end play (side to
side) clearance under O-rings at attachment point. Total
clearance should be 1 mm (0.04 in) between side face of
boss and inside edge of ear bushing (Y, Figure 143). Too
tight a fit (less than 1 mm (0.04 in)) can cause excessive
wear while too much clearance may produce excessive
noise and potentially hazardous slack control.
3. Recheck end play by forcing bucket towards opposite side
and repeating clearance measurements.
4. If an adjustment is required, remove two jam nuts (1,
Figure 143) and bolt (2) from pin (3). Add or remove shims
(4) as required. Use an equal amount of shims on each
side. Install bolt (2) and two jam nuts (1). Jam nuts must
clear boss by 1 - 2 mm (0.04 - 0.08 in) at point (X).
Inspection, Maintenance and Adjustment
4-74
WARNING
"Y"
3
4
Figure 143
2
1
FG016145
OP001123