Land Pride RC5515 - Manual (Page 34)

32
Section 5: Maintenance & Lubrication
RC5515 & RC6515 (540 RPM) RCM5515 & RCM6515 (1000 RPM) Rotary Cutter 318-721M 5/29/13
Table of Contents
Cutter Blade Maintenance
!
DANGER
Always disconnect main driveline from tractor PTO before
servicing underside of cutter. PTO can be engaged if tractor is
started causing cutter damage, bodily injury or death.
!
DANGER
Always secure cutter deck in the up position with solid
supports before servicing underside of cutter. Never work
under equipment supported by hydraulics. Hydraulics can
drop equipment if controls are actuated or if hydraulic lines
burst. Either situation can drop the cutter instantly even when
power to the hydraulics is shut off.
!
WARNING
Keep all objects out of blade bolt access hole except when
servicing cutter blades. Make sure the main driveline is
disconnected from tractor PTO before servicing cutter blades.
!
WARNING
Do not operate cutter with blades that are bent, out of balance,
excessively worn, excessively nicked, or with blade bolts that
are excessively worn. Such blades can break loose from the
cutter at high speeds causing serious injury or death.
!
CAUTION
Wear a pair of gloves when checking cutting height. Avoid
direct contact with cutting edge of blade.
Always inspect cutting blades before each use. Make
certain they are properly installed and in good working
condition. Replace any blade that is damaged, worn,
bent, or excessively nicked. Never try to straighten a bent
blade! Small nicks can be ground out when sharpening.
Refer to Figure 5-3 on page 33 when ordering Land Pride
replacement blade components.
Remove cutting blades and sharpen or replace as
follows:
1. Place tractor gear selector in park and/or set brakes,
shut engine off and remove ignition key.
2. Disconnect main driveline from tractor PTO and
secure cutter deck in the up position with solid
supports before servicing underside of cutter.
Refer to Figure 5-3 on page 33:
3. Rotate blade bolt (#1) until in alignment with access
hole “A”.
IMPORTANT: Replace cutting blades with genuine
Land Pride blades only. Blades must be replaced in
mating pairs. Not replacing both blades will result in
an out-of-balance condition that will contribute to
premature bearing breakdown on the spindle hub
and create structural cracks in the cutter housing.
4. Unscrew locknut (#5) to remove cutting blade (#2).
Blade bolt (#1) is keyed and will not turn freely.
5. Both blades should be sharpened at the same angle
as the original cutting edge and must be replaced or
re-ground at the same time to maintain proper
balance in the cutting unit. The following precautions
should be taken when sharpening blades:
a. Do not remove more material than necessary.
b. Do not heat and pound out a cutting edge.
c. Do not grind blades to a razor edge. Leave a blunt
cutting edge approximately 1/16" thick.
d. Always grind cutting edge so end of blade
remains square to cutting edge and not rounded.
e. Do not sharpen back side of blade.
f. Both blades should weigh the same with not more
than 1 1/2 oz. difference. Unbalanced blades will
cause excessive vibration which can damage
gearbox bearings and create structural cracks.
Blade Rotation
Figure 5-2
Refer to Figure 5-2:
6. Carefully check cutting edges of blades in relation to
blade carrier rotation to ensure correct blade
placement. Cutter blades must be installed with
cutting edge leading in rotation.
Refer to Figure 5-3 on page 33:
7. Insert blade bolt (#1) through blade (#2),
dishpan (#3), and flat washer (#4). Secure blade with
a new locknut (#5) and torque to 450 ft-lbs.
8. If replacing dishpan (#3), nut (#7) on gearbox output
shaft should be torqued to 550 ft-lbs. minimum and
secured with cotter pin (#6) with both legs bent
opposite directions around the nut.
9. Reconnect main driveline to tractor PTO shaft.
CCW
CCW
CW
IMPORTANT: Examine blade bolts and their flat
washers for excessive wear and replace if worn.
IMPORTANT: Locknuts can lose their ability to lock
properly once removed. Always use a new locknut
when installing blades.