Hydraulic System Information - Chamberlain LiftMaster HS670 Owner's Manual

HYDRAULIC SYSTEM INFORMATION

FLUID
1. If and when adding fluid, use ONLY hydraulic oil.
2. The tank capacity is: one (1) gallon maximum.
3. To measure the fluid in the tank, it is suggested that a ruler be
used like a dip stick. Insert it into the tank until it touches the
bottom, then remove. When tank is full, the fluidmark should
be around six inches.
DO NOT let the fluid level get below 3 to 4 inches.
PUMP
The pump on the HS670 has a built in relief valve. If the P.S.I.
should exceed its factory setting, it will bleed off the excess. The
HS670-100 is set at approximately 600 P.S.I. the HS670-200 is
set at approximately 1500 P.S.I.
1. Both models have a 4 way, 3 position, dual solenoid activated
directional valve. It operates on 24 VDC, with a built-in rectifier
on each solenoid. Reference hydraulic circuit.
2. Both models have a bypass valve with handle. When this valve is
positioned for manual operation, it will redirect the fluid back into
the tank and not through the motors. Reference hydraulic circuit.
3. Both models have a check valve built into the pump. This valve
will not allow fluid to go in the wrong direction. Reference
hydraulic circuit.
HYDRAULIC CIRCUIT
M1 A.C. Motor Pump
P Pump
T.F. Tank and Filter
M2 Hydraulic Motor
D.V. Directional Valve
M.V. Manual Valve (Bypass)
T.S. Test Station Connect Point
R.V. Relief Valve
C1 Check Valve
T R O U B L E S H O O T I N G
CLOSING
TOP LOWER
B A
A B
A B
M.V.
R.V.
C1
M1
P
T.F.
HYDRAULIC MOTORS
1. The two hydraulic motors are "ROLLER VANE" type and are
machined to be free wheeling. Each motor has a displacement
of 12 in 3 /rev.
2. The speed of each is approximately 55 RPM which equates to
a gate speed of approximately 18"/ sec. for classes 3 and 4.
For classes 1 and 2, the motor's speed is 37 RPM and gate
speed of 12"/sec.
3. The drive wheels are: HS670 1HP (1-1/2" w. x 6" dia.) HS670
2HP (2" w. x 6" dia.).
Circumference of both: 18.84"
Both have a hardness of approximately 70 "A" shore.
HOSES - FITTINGS - THREADS
1. All hoses are: S.A.E. 100 R1, type AT, single wire braid, 3/8"
I.D. (Rated working P.S.I. of 2250 and a rated burst P.S.I. of
9000).
2. For information on fittings and threads, see page 29.
OPENING
TOP
B A
A
T.S.
C1
P
T.F.
NOTES:
1. A and B are port destinations.
2. Double arrowheads designate bi-directional.
3. Single arrowhead designates one directional.
28
LOWER
A
B
B
M.V. M.V.
R.V.
M1