Chamberlain LiftMaster HS670 Owner's Manual page 29

HYDRAULIC DON'TS
1. DO NOT use only one wrench to lighten hose swivel fittings.
Use two wrenches, one to tighten and one to hold back
opposite fitting. See illustration above.
2. DO NOT pour detergent oil, mineral spirits, diesel fuel, fuel oil
or gasoline into the tank. NEVER USE BRAKE FLUID. Only use
hydraulic oil.
3. DO NOT put pipe dope or teflon tape on any part of hose
fittings.
4. DO NOT remove vent cap except to fill tank with fluid.
5. DO NOT attach hoses to fittings that have dirt on them. Clean
hoses, fittings and fitting seats carefully.
HOSES REMOVAL
NOTE: Wear adequate eye protection when performing this step.
To minimize loss of fluid when removing hoses, remove power,
position bypass valve to manual operation, and press and hold
directional valve manual override for about 30 seconds.
You will need to insert a small tool into hole and push, to activate
manual override.
HYDRAULIC PUMP DIRECTIONAL VALVE CONNECTORS
(2) One for open direction and one for closed direction.
IMPORTANT:
In directional valve solenoid (DV-1) the two brown wires attach to
terminals #1 and #2 in the connector.
In directional valve solenoid (DV-2) the two purple wires attach to
terminals #1 and #2 in the connector.
Directional Valve
Wiring Assembly
Bypass Valve
Handle
Directional Valve
Override (DV-2)
T R O U B L E S H O O T I N G
Directional Valve
Vent Cap
Relief Valve
(add fluid here)
Built-In
Manual Override
R.H. CLOSE Direction
Directional Valve
Override (DV-1)
29
One Wrench To
Must Be Clean, Hold This Fitting
No Pipe Dope
One Wrench To
Tighten This Fitting
Manual Override
R.H. OPEN Direction
Port "A" Port "B"
From Drive Motor