© 2020 Pierce Manufacturing Inc. All Rights Reserved. Cab / 6-1
Chapter 6 MAINTENANCE
Cab
6-1. Cab Tilt System
6-1.1 Cold Weather Operation
Cab lift cylinders on all Pierce Custom Chassis tilt cabs include a velocity fuse in the tilt system. This is a safety
device designed to lock fluid in the cylinders in the event that pressure is lost suddenly due to pump failure or a
broken line. The velocity fuse becomes more sensitive to actuation at low temperatures. To avoid the possibility of
locking up the cylinders when lifting the cab in extreme cold weather, replace the fluid in the cab lift system as
specified in Table 6-1.
Table 6-1: Cab Lift Cylinder Fluid Chart
Purge all air from the cab tilt system whenever replacing fluid.
6-2. Doors and Windows
6-2.1 Latches and Window Regulators
Door latches and window regulators require lubrication to reduce component wear and continue to operate
smoothly. To ensure smooth operation, remove the door panel and lubricate all moving parts on latches, paddle
handles, linkages, and regulators. The door latch mechanism requires specific attention and needs to be lubricated.
Liberally apply white lithium grease or Alpha 2000 grease between the pivot arm (cam shaped lever) and the pivot
plate of the door latch. Operate the regulator and lubricate all moving parts until the lubricant is distributed evenly.
6-2.2 Exterior Door Handles
• Exterior handles must be lubricated only with dry-film lubricants. Traditional lubricants can cause dirt and debris
to become trapped in the handle mechanism resulting in binding of the handle.
• All other areas of the door mechanism may be lubricated using white lithium grease or Alpha 2000 grease.
6-2.3 Door Strikers
Inspect the door latch strikers. Tighten loose strikers on cab side doors to 55 ft-lbs. Adjust the striker in or out to
obtain an even seal around the door with the latch closed completely. If the striker must be adjusted downward to
line up with the latch, inspect the door hinge for damage or wear. To ensure smooth operation, avoid excessive seal
compression that will require high opening forces at the paddle handle.
Temperature
F C Fluid Type
0 to 120 -18 to 49 TES-389 approved
Below 0 Below -18 MIL-H-5606 (Mobil HFA or Equivalent)
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