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The ATC37720 Roller Lifter Tappet Holding Kit enables safe camshaft removal on Mack E6, E7, and E9 engines, including tight-fit RD Cabs. Equivalent to J-37720-C, this precision tool prevents lifter damage, ensuring reliable valve train maintenance for heavy-duty fleets.

The Critical Risks of Improper Roller Lifter Handling in Mack Engines

Mack E6, E7, and E9 engines power demanding applications, but camshaft service requires holding roller lifters/tappets to avoid lobe damage or valve train misalignment. Without proper tools, lifters can fall, causing scoring, contamination, or complete engine failure—escalating repair costs and downtime.

• Lifter lobe damage – Dropped tappets score camshafts, requiring $1,500–$4,000 in resurfacing or replacement
• Valve train misalignment – Improper holding leads to timing errors, causing bent valves or piston interference ($2,000–$6,000)
• Engine contamination – Fallen lifters introduce debris, necessitating full teardown ($5,000–$10,000)
• Extended downtime – Manual holding methods take 2–4 hours per cylinder, costing $300–$700/hour in fleet losses
• Safety hazards – Working in tight RD Cabs without two-part tools risks pinched fingers or tool drops
• Warranty voids – Non-OEM methods fail inspections, adding $1,000+ in compliance fines

What is the ATC37720 Roller Lifter Tappet Holding Kit?

The ATC37720 For Mack E6 E7 E9 Roller Lifter Tappet Holding Kit J-37720C is a precision-engineered solution for securing roller lifters during camshaft removal. Featuring two-part rods (screw together for use) and included grommets, it's optimized for tight RD Cab configurations. As a direct equivalent to J-37720-C, this kit allows technicians to lift and hold tappets clear of lobes safely, streamlining service on Mack engines.

Built for professional Mack service centers and fleet shops, the ATC37720 reduces procedure time by 60%, prevents costly errors, and maintains OEM tolerances for peak engine performance.

Complete Kit Specifications & Mack Engine Compatibility

Professional Features & Engine Service Benefits

Economic Impact: Camshaft Service ROI

Scenario	Cost Impact
ATC37720 proper tappet holding	Secure lift – $580 kit investment
Dropped lifter → cam damage	$1,500–$4,000 resurfacing
Misalignment → valve issues	$2,000–$6,000 repairs
Contamination teardown	$5,000–$10,000 overhaul
Downtime from slow methods	$300–$700/hour losses
Total improper service cost	$8,800–$20,700 per job
ATC37720 ROI (first prevention)	15–36X return on investment

When Mack Technicians Choose ATC37720

• Mack E6 E7 E9 camshaft removals
• Valve train maintenance in RD Cabs
• Engine overhaul procedures
• Fleet preventive tappet service
• OEM-equivalent J-37720-C upgrades
• Heavy-duty diesel repair shops
• Precision lifter holding for timing chains

Why Professional Shops Trust ATC37720

Mack specialists and fleet maintenance teams rely on the ATC37720 for its seamless J-37720-C compatibility, two-part design for confined spaces, and proven ability to secure all cylinders without drops. It delivers three key outcomes: damage-free camshaft access, 60% faster service, and avoidance of $8,800–$20,700 in repair escalations per job.

Whether overhauling E9 engines or routine E6 tappet checks, the ATC37720 ensures precision that keeps Mack trucks hauling without interruption.

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