Linear BGUS-D User Manual

MODEL BGUS/BGUS-D • SG/SG-D OPERATOR INSTALLATION GUIDE

GENERAL:
LINEAR gate operators are designed for many years of trouble-free operation and, under recommended operating conditions, 
will require only minimal maintenance. To ensure that your unit is ready for operation at all times--and to preclude serious 
damage or failure--inspect the unit systematically. Proper adjustments and lubrication should be made as recommended.

LUBRICATION:
Bearings. For models which have pillow block style bearings with greaseable fi ttings, lubricate at least twice a year with a 
lithium complex based, petroleum oil NLGI 2 rated grease. Oilite and precision sealed bearings do not require additional 
lubrication.

Motor. Motors have sealed ball bearings and do not require further lubrication. If bearing noise develops after several years 
of operation, bearings should be replaced by a motor repair company, or the motor should be replaced if necessary.

Drive Chain and Sprocket (slide gate models only). The main drive chain and sprockets should be inspected for wear, 
cleaned, and wiped down with a lightly oiled rag every six months.

Swing Gate Arm (swing gate models only). Check all bolts for proper tension and tighten if necessary. Make sure the arm 
folds overextends itself slightly against the overtravel stop to reduce the chance that the gate can be backdriven open. Adjust 
the close limit slightly if additional travel is required. Lightly lubricate all pivot points with a light machine oil.

Barrier Gate Arm (barrier gate models only). Check all bolts for proper tension and tighten if necessary. If the arm has 
been warped or damaged, replace as necessary.

1.  For operators which utilize torque limiting clutches, check 

for proper tightness. If there appears to be dust from wear 
on the pads, inspect the pads and replace if necessary. 
If the clutch cannot be adjusted tightly enough to move 
the gate without slipping, the pads must be replaced.

2.  For operators with V-belts, inspect for wear and replace 

as necessary. Check for proper tension and adjust if 
required. Check all pulley setscrews for tightness and 
tighten if necessary.

3.  For operators with internal chain drives, inspect chain 

and sprockets for wear and replace if necessary. 
Check for proper tension and alignment, and adjust if 
required. Check all hub sprocket setscrews and tighten 
if required.

4.  Check limit switches and limit actuators (cams, limit nuts, 

etc.) for wear and replace as required. In rotary limit 
switch assemblies, wipe the limit shaft clean and apply 
a light coating of dry lubricant.

5.  For operators with magnetic brakes, check for proper 

adjustment. Brake disc must run free when the brake 
is engaged. For brake assemblies other than C-face 
style, the brake should be adjusted so that the solenoid 
plunger throw is between 3/8” to 1/2”. Too much throw 
will damage the solenoid. If the solenoid emits a loud 
buzzing sound when the motor is run, the brake must 
be adjusted.

6.  In operators which have a disconnect handle, inspect 

disconnect handle for proper function and lubricate if 
necessary. Use a lithium based grease on all moving 
parts.

7.  Inspect all nuts and bolts for proper tightness and tighten 

as necessary.

8.  Check all reversing devices for proper function. Inspect 

all contact edges for wear and replace if required. Check 
photo-eyes for proper alignment and function.

9.  Check current sensing for proper adjustment when fi nished 

with inspection and maintenance.

10.  Inspect the installation area. Are all the warning signs intact 

and visible? If they are missing or need replaced, contact 
LINEAR. Be sure there are no control stations mounted 
within reach of the gate. Review safety literature with the 
customer and advise them to remove any such stations 
found.