Black Max BMA1FLH, Quick Start Manual

FIXED LINE 
TRIMMER HEAD

BMA1FLH

WARNING: 

To reduce the risk of injury, user must read and understand 
the operator’s manual for their string trimmer before using this 
accessory. Always wear eye protection with side shields marked 
to comply with Z87.1 along with hearing protection. Ensure 
compatibility and proper fit before using this accessory. Stop the 
string trimmer and remove the power cord (electric products), 
remove the battery pack (cordless products) or remove the spark 
plug wire (gas products) before changing or adjusting accessories. 

WARNING: 

Do not use this accessory if a part is damaged or missing. If you 
are not comfortable performing any of the functions described in 
these instructions, take your unit to an authorized service center. 
Use of a trimmer head that has been improperly assembled could 
cause the trimmer head to come apart and/or detach from your 
trimmer and result in serious personal injury and/or property 
damage.

PACKING LIST

See Figure 1.

Trimmer Head, Silver Nut (M8), Black Nut (M8), Red Knob, Black 
Knob, Pre-Cut pieces of 0.095 in. Line (9), Locking Pin, Adaptor, and 
Operator’s Manual (not shown)

INSTALLING LINE

See Figures 2 - 3.

The trimmer head comes with 9 pieces of pre-cut of .095 in. trimmer 
line. Look for replacement line where you purchased this product. 
Use original manufacturer’s .095 in. replacement line for best 
performance.

 

Hold the trimmer head upside down with the posts facing up.

 

Fold a piece of pre-cut line in half so each half is 6.5 in. long. 

 

Insert the ends of the line through the eyelets in the post and pull 
tight.

 

Repeat with remaining posts.

INSTALLING TRIMMER HEAD

See Figures 4 - 7.

This fixed line trimmer head installs differently on different string 
trimmer attachments. Assembly instructions will vary based on 
the style and type of attachment you have. See figures 4 and 5 to 
determine if you have a curved shaft or straight shaft attachment 
and if your attachment comes with or without an arbor. Refer to 
the 

Installation Chart

 to determine the appropriate items for your 

attachment. Be sure to follow the instructions for your attachment 
style and type.

NOTE: 

If you cannot identify the style and type of attachment you 

have, contact customer service for assistance.

WARNING: 

Failure to use the correct adaptor, nut, and/or knob combination 
for your trimmer could cause the string head to detach from your 
trimmer and result in serious personal injury and/or property 
damage. 

Fig. 1

Fig. 2

Fig. 3

LOCKING 

PIN

TRIMMER 

HEAD

ADAPTOR

LINE

BLACK 

KNOB

BLACK 

NUT

SILVER 

NUT

RED 

KNOB

Fig. 4

STRAIGHT 

SHAFT

CURVED 

SHAFT

POST

LINE

EYELET

EYELET

CURVED SHAFT

CURVED SHAFT

INSTALLATION FOR MODELS WITH ARBORS

INSTALLATION FOR MODELS WITHOUT ARBORS

STRAIGHT SHAFT

STRAIGHT SHAFT

ARBOR

ARBOR

ADAPTOR

ADAPTOR

TRIMMER 

HEAD

TRIMMER 

HEAD

TRIMMER 

HEAD

TRIMMER 

HEAD

Fig. 5

Fig. 6

Fig. 7

CURVED SHAFTS

STRAIGHT SHAFTS

ARBOR

ARBOR

LOCKING 

PIN

BLACK 

KNOB

RED 

KNOB

BLACK 

NUT

SILVER 

NUT

 

Stop the unit and remove the power cord (electric products), 
remove the battery pack (cordless products) or remove the spark 
plug wire (gas products).

 

Following the instructions in the operator’s manual for your string 
trimmer, remove the old trimmer head.

 

Locate the items required to install the trimmer head to your 
attachment. Refer to the 

Installation Chart

 for details.

INSTALLATION CHART

If the trimmer head does not fit with any of the adaptors 
or hardware  supplied, contact Customer Service at  
1-800-726-5760 for assistance.

Style

Type

Items Needed for Installation

Curved 

Shaft

With  

Arbor

Adaptor, Black Knob 

and Trimmer Head Assembly

Curved 

Shaft

Without  

Arbor

Silver Nut and Trimmer Head Assembly

Straight 

Shaft

With  

Arbor

Adaptor, Red Knob 

and Trimmer Head Assembly

Straight 

Shaft

Without  

Arbor

Black Nut, Locking Pin,  

and Trimmer Head Assembly

For models with arbors:

 

Install line as described in 

Installing Line

.

 

Install the adaptor onto the trimmer head.

NOTE: 

When installing, align the keys located on the underside 

of the adaptor with the corresponding holes in the trimmer head.

 

Slide the adaptor and trimmer head onto the arbor.

 

Secure the trimmer head in place by pressing it down firmly and 
installing the knob into the opening in the arbor.

For curved shaft models

, install the black knob and turn clockwise. 

Make sure knob is fully seated into arbor. 

Do not overtighten.

For straight shaft models

, install the red knob and turn 

counterclockwise. Make sure knob is fully screwed into arbor. 

Do not overtighten.

For models without arbors:

 

Insert nut (M8) into the hex pocket in the trimmer head, then twist 
trimmer head onto the attachment.

For curved shaft models

, insert silver nut and turn trimmer head 

clockwise to secure. If necessary, use a wrench (not provided) to 
hold the flange washer while tightening the trimmer head.

For straight shaft models

, insert black nut and turn trimmer 

head counterclockwise to secure. If necessary, use a wrench (not 
provided) or locking pin to hold the flange washer while tightening 
the trimmer head. 

Hart Consumer Products, Inc.

P.O. Box 1348, Anderson, SC  29622 USA

1-800-726-5760

www.blackmaxtools.com

998000026 

9-13-19 (REV:01)