Adjusting Bucket Linkage - Hitachi EX27U Operator's Manual

Adjusting Bucket Linkage

The machine has a bucket adjustment system to take up
play in the linkage. When play in the linkage increases,
first remove shims. Then, install shims as follows:
1. Park the machine on a firm, level surface. Lower the
bucket to the ground with the flat side down so the
bucket will not roll. Move the O-ring as shown.
2. Run engine at slow idle. With the bucket on the
ground, slowly swing counterclockwise slightly until
the top of the left bucket boss contacts the arm.
3. Stop the engine. Pull the pilot control shut-off lever to
the LOCK position.
NOTE: Bolts (1) need not be removed to remove shims.
Shims are a split type that can be removed eas-
ily by pushing them out with a screwdriver after
bolts (1) have been loosened.
4. Loosen three (M8) bolts (1) using a 13 mm wrench.
Remove all shims (2) from between plate (3) and
bucket.
5. Push and hold bolts (1) to remove all clearance (a)
between arm and boss (4). Holding boss (4) against
arm increases clearance (b). Measure distance (b)
using a feeler gauge. Install as many shims (2) into
clearance (b) as possible.
NOTE: Remaining shims (2) must be installed in
clearance (c) to prevent arm end face or bolt
damage.
6. Install remaining shims (2) into clearance (c) and
tighten bolts (1) to 10 N⋅m (1 kgf⋅m, 7.2 lbf⋅ft).
NOTE: (1) Total number of shims (2) used is 6 (3
pairs).
(2) Replace boss (4) if measurement (d) is 2
mm (0.08 in) or less.
MAINTENANCE
Bucket
7-57
Pin
O-Ring Shift
Bucket Boss
Clearance
Pin Arm
"d"
Clearance "a"
Clearance "b"
SECTION II
M503-07-056
M503-07-088
II 4
2
3
1
Clearance
"c"
II
M104-07-066