SkyTrak 6036 Service Manual - Manual (Page 31)

Model 6036 S/N 9B0499 and Before 3-13
Section 3. Boom
B C A A B (FIG. 3.13)
4. With the boom extended fully, apply MPG to
the extend chain using a brush or grease gun.
5. Replace the rear outer boom cover.
3.2 EMERGENCY BOOM
LOWERING
3.2.1 Loss of Engine Power
or Hydraulic Pump Failure
If you lose engine power or hydraulics with an
elevated boom, lower the boom to the ground by
using the following procedure:
IMPORTANT: If the boom has been extended, you
must first retract the boom before you attempt to
lower the boom.
To retract the boom proceed as follows:
1. Block the boom so it cannot be lowered.
2. At the base end of the extend/retract cylinder,
locate the counterbalance valve cartridge, Fig.
3.18. Loosen the retainer nut and turn the
adjusting screw in (clockwise) until it bottoms
out. Doing this will render the counterbalance
valve inoperative.
3. Clear the area around the machine of all
personnel and return to the operators cab.
4. Move the boom control lever to the left and
retract the boom.
4. Loosen capscrews securing the hose clamps
to the inner boom, Fig. 3.16a or Fig. 3.16b.
5. Manually remove all hose slack between the
pulley and the inner boom hose clamps and the
pulley and the outer boom tubes. Pull the
hoses through the hose clamps, towards the
front of the boom, until there is 180° of hose in
contact with the pulley.
6. Pull the hoses 1" further into the hose clamps
so the hose achieves more than 180° of
contact with the pulley and at the same time
tighten the clamp capscrews.
7. If the vehicle has auxilliary hydraulics, replace
the upper hoses and clamps onto the lower
hose clamps. Do not fully tighten the cap-
screws. Repeat steps 4 through 6 for the upper
hoses and clamps.
8. Replace the rear boom cover.
3.1.10 Long Term Storage Preparation
Remove rust and corrosion from sliding surfaces
and coat with grease.
Fig. 3.17 Forklift Lubrication Points
3.1.11 Boom Lubrication Points
Lubricate the following grease fittings using Multi-
Purpose Grease (MPG) every 50 hour interval.
Refer to Fig. 3.17.
A. Hydraulic cylinder pins (8 points)
B. Boom chain sheaves (2 points)
C. Boom pivot pins (2 points)
D. Carriage pivot pin (2 points)
Lubricate the boom extend and retract chains using
Multi-Purpose Grease (MPG) every 250 hour
interval.
1. Prepare to grease the chains by removing the
rear cover from the outer boom.
2. Apply MPG to retract chain using a brush or
grease gun.
3. Extend and retract the boom several times to
permit grease to penetrate the entire chain.
Fig. 3.18 Counterbalance Valve on Boom Extend/
Retract Cylinder
A
RETAINER NUT
COUNTERBALANCE VALVE
ADJUSTING
SCREW
A
A
D
Warning !
OA0182
OA0542
EXTEND/RETRACT
CYLINDER
DO NOT get under a raised boom unless the
boom is blocked up. Always block the boom
before doing any servicing which requires the
boom to be up.