A/T - ZF 4 HP-22 Slipping/No Reverse/3-4 Shuttle Shift

DATE: Nov 92

TECHNICAL BULLETIN # 143

TRANSMISSION: ZF 4 HP-22

SUBJECT:
LOW LINE PRESSURE, 3-4 SHUTTLE SHIFT, SLIPPING/NO REVERSE

APPLICATION: BMW, VOLVO, LINCOLN

ZF 4 HP-22

LOW LINE/NO REVERSE/3-4-3 SHUTTLE SHIFTS




The "F" clutch drum has 3 cup plugs installed in it, which may be blown out, or fall out during overhaul. Several complaints can result depending on which plugs are missing.

COMMON SYMPTOMS ARE:

1. 3-4-3 SHUTTLE SHIFTING

2. LOW LINE PRESSURE

3. HARSH DOWNSHIFTS

4. NO REVERSE/SLIPPING REVERSE

5. NO ENGINE BRAKING

6. LATE OR NO 4TH GEAR