Vestil ACH-100 User Manual
Page 19
15
T
TR
RO
OU
UB
BL
LE
E
P
PR
RO
OB
BA
AB
BL
LE
E C
CA
AU
US
SE
E
R
RE
EM
ME
ED
DY
Y
1. Hoist does not operate.
a. Insufficient air pressure at source.
b. Insufficient air supply at hoist.
c. Clogged air intake or muffler.
d. Excessive overload.
e. Clogged valve block.
f. Clogged pendant throttle control.
g. Motor failure.
h. Lack of lubrication.
i. Brake not operating.
a. Check and adjust air pressure.
b. Use correct size air supply hose (see
page 3).
c. Shut off air supply, disconnect air supply
hose and clean air filter and muffler.
d. Reduce load to the rated capacity of the
hoist.
e. Disassemble and check for free movement
of pistons.
f. Disassemble and check parts (see page 8).
g. Disassemble motor and check rotor vanes
(see page 16).
h. Make sure there is oil in the lubricator.
i. Make sure the air tubing to the brake are not
kinked or pinched. Disassemble brake and
check for proper piston operation (see page 7).
Replace worn or damaged parts.
2. Hoist will not hold load in
suspension.
a. Brake not holding.
b. Broken brake spring.
c. Excessive overload.
a. See item 1(i).
b. Replace spring.
c. See item 1(d).
3. Hook will raise but will not
lower or hook will lower but
not raise.
a. Clogged pendant throttle control.
b. Clogged valve block.
c. Excessive load.
a. See item 1(f).
b. See item 1(e).
c. See item 1(d).
4. Hoist looses power.
a. Insufficient air pressure.
b. Clogged valve block.
c. Clogged muffler.
d. Worn or broken rotor vanes.
a. See item 1(a).
b. See item 1(e).
c. Clean or replace muffler.
d. Replace worn or damaged rotor vanes (see
page 9).
5. Pendant throttle control
levers do not return to off
position.
a. Foreign material, rust or corrosion in
pendant throttle control, levers bent
or lever pivot pin bent.
a. Clean pendant throttle control and replace
worn or damaged parts. (see page 8).
6. Cannot regulate speed
using the pendant throttle
control levers.
a. Brake not operating properly.
b. Pendant throttle control not
operating properly.
a. See item 1(i).
b. See item 5.
7. Lifting and lowering speeds
differ from rated speeds.
a. Incorrect air pressure or inadequate
air supply.
b. Loss of power.
a. Check air pressure at hoist when hoist is
operating. (see page 3).
b. See item 1(b).
16
PENDANT THROTTLE CONTROL
(Refer to Exploded View on Pages 13 & 14)
A.
Disconnect the hoist from the air supply system and depress the operating levers to exhaust the air from the hoist.
B.
Disconnect the three air hoses from the top of the pendant throttle control.
C.
Remove the strain line from the top of the control handle (620-557).
D.
Remove the two throttle valve caps (620-555) from the back side of the control handle .
E.
Remove the throttle valve spring (620-554) from under each cap.
F.
Thread a #10-24 screw into the threaded hole in the throttle valve (620-552) and pull the valve out of the control handle.
G. Clean all parts thoroughly using a mild solvent and check them for wear and damage. Check levers (620-551) for free
movement. Replace all worn or damaged parts.
H.
Lightly lubricate all parts and re-assemble the pendant throttle in the reverse order.
I.
Re-attach the air tubes to the top of the control handle and reconnect the strain line.
J.
Reconnect the hoist to the air supply and test for proper operation.
MOTOR REBUILD:
1.
Remove dead end screws (12) from dead end cap (11). Remove dead end cap (11) and dead end gasket (10) from
dead end plate (9).
2.
Remove dead end plate bolts (13) from dead end plate (9). (Use proper tool, do not use a screwdriver to remove dead
end plate).
3.
Remove the dowel pins from the body (8) and push back into end plate until flush or just below the machined surface
of the dead end plate.
4.
Remove rotor (4) using an arbor press.
5.
Remove vanes (5), vanes springs (7) and spring pins (6).
6.
Remove shaft seal (1) and bearing (2) from drive end plate (3) and bearing (2A) from dead end plate (9). (Use proper
tools). Do not remove drive end plate bolts (14) or drive end plate (3).
7.
Clean parts. Check for scoring on the dead end plate (9), drive end plate (3) and rotor assembly (4). If scoring exists,
motor should be replaced.
8.
Place vane springs (7) and push pins (6) into rotor (4).
9.
Place the drive shaft of the rotor assembly (4) through the drive end plate (3). Press the drive end bearing (2) onto the
rotor drive shaft. (Use Proper Tool.) Lightly tap on inner race of the drive end bearing (2) to snug up rotor (4) to drive
end plate (3).
10. Install new vanes (5). The notch on the vane faces to center of the rotor (4).
11. Place end plate gasket (10) on the body of the dead end (9). Place the dead end plate (9) on the body (8). Install the
dead end bearing (2A) and press into place. (Use Proper Tool).
12. Install the dowel pin and fully tighten the remaining bolts to 80-120 In-Lbs. Set end clearances as required. Lightly tap
on the inner race of the dead end bearing (2A) to free up and center the rotor (4) in the body (8).
13. Apply a small amount of grease to bearing seal and install the drive end bearing seal by pressing flush. (Use Proper
Tools.)
14. Reattach dead end cap (11) with dead end cap screws (12). Apply a few drops of 10W oil into ports and rotate shaft by
hand for a few rotations.
TROUBLESHOOTING