BENDIX BW7257 manual Lubrication, Inspection, Brake Air Chambers, Camshaft Bushings

Page 13

 

 

 

 

 

 

 

 

Maintenance

 

 

Brake Adjuster Maintenance–General

 

 

 

 

 

Service Intervals

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Component

 

Visual Inspection

 

Lubrication Interval

Type of Lubricant

 

 

 

 

 

 

 

 

 

 

 

 

 

Standard

 

 

 

 

 

Adjusters manufactured prior to 6/1/96 –

 

 

 

 

 

 

During normal

chassis

 

every 50,000 miles or every 3 months.

Standard Chassis Grease

 

 

 

 

 

Adjusters manufactured

 

 

 

 

lubrication

or 3

months

 

 

 

 

 

 

 

 

after 6/1/96 – once a year.

 

 

 

 

 

 

which ever

occures first.

 

 

 

 

 

Low Lube

 

 

Once a year

SHC 460

Synthetic

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Lube Free

 

 

 

 

 

None

*Lubricated

at Factory

 

 

 

 

 

 

 

 

 

*Lube free Spicer® brand self adjusting brake adjusters are manufactured without a grease fitting.

 

 

 

Lubrication

Caution: Do not use moly-disulfide loaded grease or oil because they may shorten brake adjuster service life. Do not use pressure-release grease fittings.

Important: In no case should the lubrication interval exceed the published intervals in table above.

Lube Free Spicer® brand self adjusting brake adjusters are lubricated at the factory with a proprietary grease and do not require lubrication at service intervals.

Note: Spicer® brand self adjusting brake adjusters manufactured after May 30, 1996 have incorporated an improved sealing and grease filling technique. This makes it possible to extend service

intervals, thus reducing maintenance.

Inspection

Bendix Spicer Foundation Brake strongly recommends that routine visual/operational checks, including brackets and control arms, be performed at each Preventative Maintenance Service Interval.

Adjusters or anchor brackets that have visual damage, or which fail the operational checks, MUST be replaced immediately.

Inspect brake adjuster and anchor bracket for damage. Check that anchor bracket is tight and the control arm is in the full release position.

Note: If self adjusting brake adjuster is equipped with indicator arrow, make sure the indicator is within the slow when the brake is in the release position.

Automatic adjusters should not be operated as manual adjusters except as may be necessary to get the vehicle off the road for service.

Maintaining proper brake adjustment and brake balance cannot

be accomplished by the brake adjuster alone. The condition of founda- tion brake components have a direct bearing on the

effectiveness of brake adjustment. Inspect foundation brake components periodically.

Brake Air Chambers

Check that brake air chamber mounting bolts are tight and properly aligned to avoid interference between air chamber pushrod and air chamber housing.

Verify that brake chamber pushrod length is equal on both brake chambers of the same axle.

Camshaft Bushings

Worn “S” cam bushings will increase push rod travel. Replace bushing if worn and at each reline.

For detailed inspection procedure on foundation brake components refer to Bendix Spicer Foundation Brake service manual BW7258.

Wheel Bearing Adjustment

Accurate wheel bearing preload is necessary to maintain proper alignment between the brake drum and brake shoes.

Checking Release Torque

The following procedure verifies proper operation of the automatic brake adjuster.

Place a torque wrench on the 7/16" adjusting hex. (See Figure 19.) Turn the torque wrench counterclockwise. The clutch should not slip at a torque less than 13 lb. ft. (18 N•m). A racheting sound occurs when the clutch slips. If clutch slips at a lesser torque, replace the adjuster.

RACHETING SOUND OCCURS

WHEN CLUTCH SLIPS

13 lb. ft.

(18 N•m)

12

Figure 19 Checking Release Torque

 

Image 13
Contents Spicer Automatic Slack Adjuster Important Notice Contents Self Adjusting Brake AdjusterIntroduction/Operation When the brake appliesIntroduction Operation10068 Typical Applications Steer Axle InstallationsStraight Clamp-Type Installation Drive Axle InstallationsUniversal Anchor Bracket Trailer Axle InstallationsTip The universal anchor bracket mounts to the S cam PRE-1993Anchor Stud Installation Anchor Stud InstallationInstallation Procedure InstallationAttach the Self Adjusting Brake Adjuster Position the Control Arm Final Inspection of the Self Adjusting Brake AdjusterAdjust the Self Adjusting Brake Adjuster Lubrication Wheel Bearing AdjustmentInspection Brake Air ChambersTroubleshooting Operational Check/TroubleshootingOperational Check Tight or Dragging BrakesParts Books Additional Service Information