REAR LOADER
5.16
2 Turn adjusting screw of Relief “C” in (clockwise) 2-
1/2 turns.
3. Pull ejector cylinder control lever to extend cylinder
full out and momentarily bottom cylinder. Release the
lever.
4. Pressure is now trapped in the cylinder. Check
pressure gauge in ejector line. It should read
approximately 1800* PSI.
NOTE: If pressure does not hold, turn relief “C”
adjusting screw in (clockwise) 1/2 turn and repeat
steps 3 and 4.
5. Push the upper panel control lever and leave it in
detented position, (upper panel cylinders bottomed in
up position).
6. Observing both pressure gauges, slowly turn out
(counterclockwise) on Relief “C” adjusting screw until
Relief “C” reaches 2350 PSI, the ejector line pressure
gauge will fall rapidly to 0 PSI. Relief “C” is now set at
2350 PSI.
NOTE: Manually shift the upper panel control lever to
neutral.
7. Reinstall plugs or caps covering Reliefs “B” and “C”.
8. Reconnect the top kick-out, reverse Step 5 in Relief
“B” adjustment.
9. Follow procedures to readjust the main relief.
D. UNDERBODY VALVE – MAIN RELIEF
NOTE: ALL ADJUSTMENTS MUST BE MADE WITH
THROTTLE ADVANCE ENGAGED.
NOTE: Hydraulic oil must be at or near operating
temperature. If not, warm, see “Before Starting
Adjustments” on page 9.15.
Remove dirt and grease around main relief.
1. Lock tailgate clamps and pull tailgate raise control
lever.
2. Read system pressure gauge, it should read 2500
+50/-0 PSI.
3. Remove dome nut.
4. Loosen lock nut.
1. ADJUSTMENT OF RELIEF VALVE “B”
8. Lock the tailgate clamps and pull tailgate raise
control lever, reading the main system pressure
gauge. Adjust main system down until the gauge
reads 2100 PSI.
9. Remove plugs or caps covering relief valve “B” and
“C” in the ejector unload valve, see figure 6.
10. Turn adjustment screw of Valve “C” out of body 2
full turns (counterclockwise).
11. Turn adjustment screw of Valve “B” into the body 2
full turns (clockwise).
12. Pull ejector cylinder control lever to extend cylinder
full out and momentarily bottom cylinder. Release the
lever.
13. Pressure is now trapped in the cylinder. Check
pressure gauge in ejector line. It should read
approximately 1800* PSI.
NOTE: If pressure does not hold, turn relief “B”
adjusting screw in (clockwise) 1/2 turn and repeat
steps 12 and 13.
14. Push the upper panel control lever and leave it in
detented position, (upper panel cylinders bottomed in
up position).
15. Observing both pressure gauges, slowly turn out
(counterclockwise) on Relief “B” adjusting screw until
Relief “B” reaches 2100 PSI, the ejector line pressure
gauge will fall rapidly to 0 PSI. Relief “B” is now set at
2100 PSI.
NOTE: Manually shift the upper panel control lever to
neutral.
2. ADJUSTMENT OF RELIEF VALVE “C”
NOTE: ALL ADJUSTMENTS MUST BE MADE WITH
THROTTLE ADVANCE ENGAGED.
1. Lock tailgate clamps and pull tailgate raise control
lever, reading the main system pressure gauge.
Adjust main system pressure up until gauge reads
2350 PSI.
*1800 PSI is an approximate measurement to insure pressure is
trapped in the ejector line when the ejector is extended and the body
is empty.
As long as the trapped pressure is maintained above 1000 PSI for
one minute, the ejector blade resistance system will operate
properly with no detrimental affect on payload.
ISSUED JUNE 2003 Printed in U.S.A.
©COPYRIGHT 2003, H.E.I.L.
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