National Mower HYDRO HYD70OM-8/99 - Manual (Page 14)

HY70OM-8/99
14
REEL CONTROL CLUTCH
ADJUSTMENT, Continued
If clutch idler is restricted from its proper
function, (engaging and disengaging reel belt drive),
follow these steps. Refer to figure on the previous page.
1. Make sure clutch rod is free from any restriction by
moving lever arm back and forth.
2. Loosen mounting bolts for the clutch idler. If the
mounting bolts are torqued too tight, it restricts idler
movement.
3. Loosen the pivot bolt between the idler arm and lift
strap. Any restriction at this point will cause
restriction with the idler arm.
7.4— SEAT SWITCH ADJUSTMENT
The HYDRO 70 has a safety switch mounted
directly to the seat bottom. The switch requires no
adjustment.
If wires should become disconnected
from the seat switch it prohibits other
safety features from working properly.
To avoid possible serious bodily injury,
before performing any adjustments,
maintenance, or lubrication, place all
controls in “Neutral”, lower the mowers to
the ground, engage parking brake, turn
ignition switch off and remove key.
7.5—HEIGHT OF CUT ADJUSTMENT
The height of cut is variable and adjusted by
moving the front and rear roller brackets to the desired
height.
It is important to get all rollers adjusted to the
same height, keeping the bed knife parallel to the
ground, so that there will be uniform cutting on the entire
width of the mower. Do not adjust rollers by sight.
After loosening adjusting nuts on each side of
the reel assembly, place a gauge plate under the
bedknife and roller measuring the distance between
bedknife cutting edge and the rollers. Adjust front and
rear rollers equally and insure that the bottom of the
bedknife is parallel with the ground. After height of cut
setting is determined, re-tighten roller adjustment nuts.
A height of cut tool, Part #070009 (shown
below), complete with instructions, is
available through the National Mower
Parts Department.
NOTE
INSTRUCTIONS:
1. Preparation of bar—Position round head capscrew
to desired height of cut. Measure from flat surface of
bar to the underside of round head screw. Lock
round head screw in position with wing nut.
Position hex head capscrew 1/8 less than desired
height of cut. Measure from flat surface of bar to the
top of the hex head capscrew. Lock hex head
capscrew in position with wing nut.
2. Setting height of cut—Hook round head screw on top
edge of bedknife, and rest hex head capscrew
against bedbar.
Adjust front and rear roller adjusters so that the
rollers contact bar. Check roller placement for the full
length of the cutting unit by moving the bar side to
side while still located on the bedknife/bedbar to
achieve consistent height of cut the full width of the
cutting unit. Lock roller adjusters in place.
ROLLER ADJUSTERS
BED BAR
BED
KNIFE
BAR
ROUND HEAD
SCREW WING NUT
HEX HEAD
CAPSCREW